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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