Fair value of financial instruments Fair value of financial instruments (Details)
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3 Months Ended |
9 Months Ended |
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Sep. 30, 2018
USD ($)
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Sep. 30, 2018
USD ($)
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Dec. 31, 2017
USD ($)
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Jul. 18, 2017
USD ($)
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Mar. 31, 2016
derivative_instrument
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| Not Designated as Hedging Instrument | Foreign Exchange Contract |
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| Debt Instrument [Line Items] |
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| Notional value |
$ 153,400,000.0
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$ 153,400,000.0
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| Weighted average maturity |
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2 months
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| Designated as Hedging Instrument | Interest Rate Swap |
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| Debt Instrument [Line Items] |
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| Notional value |
40,000,000
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$ 40,000,000
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| Weighted average maturity |
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1 year 3 months 15 days
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| Number of interest rate swaps | derivative_instrument |
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2
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| Designated as Hedging Instrument | Interest Rate Swap | Level 2 |
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| Debt Instrument [Line Items] |
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| Fair Value of swap, net |
1,600,000
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$ 1,600,000
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| Prepaid Expenses and Other Current Assets | Not Designated as Hedging Instrument | Foreign Exchange Contract | Level 2 |
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| Debt Instrument [Line Items] |
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| Fair value of foreign currency contract, net |
1,400,000
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1,400,000
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| Prepaid Expenses and Other Current Assets | Designated as Hedging Instrument | Interest Rate Swap | Level 2 |
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| Debt Instrument [Line Items] |
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| Fair value of swap, asset position |
600,000
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600,000
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| Other Assets | Designated as Hedging Instrument | Interest Rate Swap | Level 2 |
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| Debt Instrument [Line Items] |
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| Fair value of swap, asset position |
1,000,000
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1,000,000
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| Six hundred million senior unsecured notes |
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| Debt Instrument [Line Items] |
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| Carrying value |
600,000,000
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600,000,000
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$ 600,000,000
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| Six hundred million senior unsecured notes | Level 3 |
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| Debt Instrument [Line Items] |
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| Fair value |
$ 552,400,000
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552,400,000
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$ 590,600,000
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| Maco |
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| Debt Instrument [Line Items] |
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| Scheduled installments period |
1 year 3 months
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| Potential undiscounted amount minimum |
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$ 0
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| Potential undiscounted amount maximum |
$ 30,300,000
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30,300,000
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30,300,000.0
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| Contingent consideration |
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$ 28,700,000
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| Maco | Level 3 |
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| Debt Instrument [Line Items] |
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| Contingent consideration |
29,700,000
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29,700,000
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| Maco | Accrued Liabilities | Level 3 |
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| Debt Instrument [Line Items] |
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| Contingent consideration |
15,100,000
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15,100,000
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| Maco | Other Noncurrent Liabilities | Level 3 |
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| Debt Instrument [Line Items] |
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| Contingent consideration |
$ 14,600,000
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$ 14,600,000
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| Measurement Input, Revenue Multiple | Maco |
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| Debt Instrument [Line Items] |
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| Revenue multiple |
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2.5
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