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Debt (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Line of Credit Facility [Line Items] |  |
Long-term debt, net of debt issuance costs | $ 671.5 | $ 690.6
Line of Credit Facility, Maximum Borrowing Capacity | 61.5 |
Letters of Credit Outstanding, Amount | 8.6 | 9.0
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs | (15.9) | (15.3)
Agreement expires September 23, 2019, Extension [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 375.0 | 375.0
Long-term senior notes, 4.4%, due November 2022 [Member] |  |
Line of Credit Facility [Line Items] |  |
Long-term debt, net of debt issuance costs | 273.5 | 273.0
Unamortized Debt Issuance Expense | 2.0 | 2.3
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 | 199.0 | 208.8
Debt Instrument, Face Amount | $ 175.0 | $ 0.0
Debt Instrument, Interest Rate, Stated Percentage | 1.96% | 0.00%
Unamortized Debt Issuance Expense | $ 1.2 | $ 0.0
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 | 199.0 | 208.8
Debt Instrument, Face Amount | $ 175.0 | $ 0.0
Debt Instrument, Interest Rate, Stated Percentage | 2.21% | 0.00%
Unamortized Debt Issuance Expense | $ 1.1 | $ 0.0
Long-Term Senior Notes [Member] |  |
Line of Credit Facility [Line Items] |  |
Debt Instrument, Face Amount | $ 275.0 | 275.0
Debt Instrument, Interest Rate, Stated Percentage | 4.40% |
Unamortized Debt Issuance Expense | $ 3.7 | 4.3
Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,750.0 |
Pricing on the Facility based on market rates | LIBOR plus 0.875% to 1.35% |
Description of variable rate basis | LIBOR |
Basis spread on variable rate | 0.95% |
Line of Credit Facility, Average Outstanding Amount | $ 364.1 | 888.5
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs | $ (15.9) | $ (15.3)
Line of Credit Facility, Interest Rate During Period | 2.90% | 2.00%
Unamortized Debt Issuance Expense | $ 15.9 | $ 15.3

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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