Financing Arrangements - Components of Long-Term Debt (Details) - USD ($)
$ in Millions |
3 Months Ended |
12 Months Ended |
Mar. 31, 2020 |
Dec. 31, 2019 |
| Debt Instrument [Line Items] |
|
|
| Principal Amount |
$ 1,240.6
|
$ 1,242.8
|
| Unamortized discount and debt issuance cost |
12.7
|
13.5
|
| Long-term Debt, Total |
1,227.9
|
1,229.3
|
| Less short-term and current portion of long-term debt, Principal Amount |
18.2
|
18.4
|
| Less short-term and current portion of long-term debt, Unamortized discount and debt issuance cost |
0.0
|
0.0
|
| Less short-term and current portion of long-term debt |
18.2
|
18.4
|
| Total long-term debt, gross, net of current |
1,222.4
|
1,224.4
|
| Debt excluding current, unamortized discount and debt issuance costs |
12.7
|
13.5
|
| Total long-term debt, net of current portion |
1,209.7
|
1,210.9
|
| Senior secured revolving credit facility due 2022 | Revolving Credit Facility |
|
|
| Debt Instrument [Line Items] |
|
|
| Principal Amount |
0.0
|
0.0
|
| Unamortized discount and debt issuance cost |
0.0
|
0.0
|
| Long-term Debt, Total |
$ 0.0
|
$ 0.0
|
| Weighted average interest rate |
0.00%
|
3.90%
|
| Senior secured term loan due 2026 | Secured Debt |
|
|
| Debt Instrument [Line Items] |
|
|
| Principal Amount |
$ 622.9
|
$ 624.5
|
| Unamortized discount and debt issuance cost |
9.3
|
9.8
|
| Long-term Debt, Total |
$ 613.6
|
$ 614.7
|
| Weighted average interest rate |
3.35%
|
4.01%
|
| 5.25% Senior Notes Due 2023 | Senior Notes |
|
|
| Debt Instrument [Line Items] |
|
|
| Interest rate, stated percentage |
5.25%
|
5.25%
|
| Principal Amount |
$ 600.0
|
$ 600.0
|
| Unamortized discount and debt issuance cost |
3.4
|
3.7
|
| Long-term Debt, Total |
$ 596.6
|
$ 596.3
|
| Weighted average interest rate |
5.25%
|
5.25%
|
| Other Debt |
|
|
| Debt Instrument [Line Items] |
|
|
| Principal Amount |
$ 17.7
|
$ 18.3
|
| Unamortized discount and debt issuance cost |
0.0
|
0.0
|
| Long-term Debt, Total |
$ 17.7
|
$ 18.3
|