Long-term Debt (Details) - USD ($)
$ in Millions |
3 Months Ended |
|
Mar. 31, 2017 |
Dec. 31, 2016 |
| Debt Instrument [Line Items] |
|
|
|
| Long-term Debt, Gross |
|
$ 1,606.0
|
$ 1,604.6
|
| Long-term Debt, Current Maturities |
|
324.1
|
323.9
|
| Long-term Debt, Excluding Current Maturities |
|
$ 1,281.9
|
1,280.7
|
| 2.25% Notes |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Debt Instrument, Maturity Date |
|
Nov. 15, 2017
|
|
| Debt Instrument, Interest Rate, Stated Percentage |
|
2.25%
|
|
| Debt Instrument, Interest Rate, Effective Percentage |
|
2.30%
|
|
| Debt Instrument, Unamortized Discount |
|
$ 0.1
|
|
| Debt Instrument, Unamortized Debt Issuance Costs |
|
0.3
|
|
| Long-term Debt, Gross |
|
299.6
|
299.4
|
| Long-term Debt, Fair Value |
[1] |
$ 301.4
|
301.4
|
| 4.00% Notes |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Debt Instrument, Maturity Date |
|
Mar. 15, 2022
|
|
| Debt Instrument, Interest Rate, Stated Percentage |
|
4.00%
|
|
| Debt Instrument, Interest Rate, Effective Percentage |
|
4.13%
|
|
| Debt Instrument, Unamortized Discount |
|
$ 1.5
|
|
| Debt Instrument, Unamortized Debt Issuance Costs |
|
1.3
|
|
| Long-term Debt, Gross |
|
247.2
|
247.0
|
| Long-term Debt, Fair Value |
[1] |
$ 260.2
|
258.4
|
| 3.75% Notes |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Debt Instrument, Maturity Date |
|
Feb. 15, 2023
|
|
| Debt Instrument, Interest Rate, Stated Percentage |
|
3.75%
|
|
| Debt Instrument, Interest Rate, Effective Percentage |
|
4.32%
|
|
| Debt Instrument, Unamortized Discount |
|
$ 0.9
|
|
| Debt Instrument, Unamortized Debt Issuance Costs |
|
2.4
|
|
| Long-term Debt, Gross |
|
496.7
|
496.6
|
| Long-term Debt, Fair Value |
[1] |
$ 507.3
|
503.3
|
| 4.20% Notes |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Debt Instrument, Maturity Date |
|
Apr. 15, 2024
|
|
| Debt Instrument, Interest Rate, Stated Percentage |
|
4.20%
|
|
| Debt Instrument, Interest Rate, Effective Percentage |
|
4.24%
|
|
| Debt Instrument, Unamortized Discount |
|
$ 0.7
|
|
| Debt Instrument, Unamortized Debt Issuance Costs |
|
2.9
|
|
| Long-term Debt, Gross |
|
496.4
|
496.2
|
| Long-term Debt, Fair Value |
[1] |
516.3
|
511.6
|
| Other notes payable and capitalized leases |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Long-term Debt, Gross |
|
66.1
|
65.4
|
| Long-term Debt, Fair Value |
[1] |
$ 66.1
|
$ 65.4
|
|
|