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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