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Debt (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Sep. 30, 2017
Line of Credit Facility [Line Items] |  |  |  |
Long-term debt, net of debt issuance costs | $ 690.6 | $ 272.7 | $ 690.6 |
Line of Credit Facility, Maximum Borrowing Capacity | 850.0 | 1,025.0 | 850.0 |
Letters of Credit Outstanding, Amount |  | 18.2 |  | $ 9.0
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs | (15.3) | 905.4 | (15.3) |
Borrowing capacity remaining | 95.3 |  | 95.3 |
Debt Instrument, Face Amount | 350.0 |  | 350.0 |
Long-term senior notes, 4.4%, due November 2022 [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Long-term debt, net of debt issuance costs | 273.0 | 272.7 | 273.0 |
Unamortized Debt Issuance Expense | 2.0 | 2.3 | 2.0 |
Long-term senior notes, Euro notes, 1.96%, due June 2027 [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Long-term debt, net of debt issuance costs | 208.8 | 0.0 | 208.8 |
Debt Instrument, Face Amount | $ 175.0 | $ 0.0 | $ 175.0 |
Debt Instrument, Interest Rate, Stated Percentage | 1.96% | 0.00% | 1.96% |
Unamortized Debt Issuance Expense | $ 1.2 | $ 0.0 | $ 1.2 |
Long-term senior notes, Euro notes, 2.21%, due June 2029 [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Long-term debt, net of debt issuance costs | 208.8 | 0.0 | 208.8 |
Debt Instrument, Face Amount | $ 175.0 | $ 0.0 | $ 175.0 |
Debt Instrument, Interest Rate, Stated Percentage | 2.21% | 0.00% | 2.21% |
Unamortized Debt Issuance Expense | $ 1.1 | $ 0.0 | $ 1.1 |
Private Placement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Senior Notes | 393.2 |  | 393.2 |
Long-Term Senior Notes [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 275.0 | 275.0 | $ 275.0 |
Debt Instrument, Interest Rate, Stated Percentage | 4.40% |  | 4.40% |
Unamortized Debt Issuance Expense | $ 4.3 | 2.3 | $ 4.3 |
Line of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 2,750.0 |  | $ 2,750.0 |
Pricing on the Facility based on market rates |  |  | LIBOR plus 0.95% to 2.05% |
Description of variable rate basis |  |  | LIBOR |
Basis spread on variable rate |  |  | 1.05% |
Line of Credit Facility, Average Outstanding Amount | 888.5 | 981.6 |  |
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs | $ (15.3) | $ 905.4 | $ (15.3) |
Line of Credit Facility, Interest Rate During Period | 2.00% | 1.50% |  |
Unamortized Debt Issuance Expense | $ 15.3 | $ 19.6 | $ 15.3 |

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