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Debt (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]            
Letters of Credit Outstanding, Amount $ 18.2   $ 18.2     $ 18.2
Borrowing capacity remaining 70.4   70.4      
Short-term borrowings 55.7   55.7     49.2
Bank Overdrafts 39.4   39.4     24.6
Unamortized Debt Issuance Expense           18.1
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%     4.40%
Unamortized Debt Issuance Expense $ 2.4   $ 2.4     $ 2.7
Minimum [Member]            
Line of Credit Facility [Line Items]            
Description of Variable Rate Basis     LIBOR      
Basis spread on variable rate (in hundredths)     0.95%      
Maximum [Member]            
Line of Credit Facility [Line Items]            
Description of Variable Rate Basis     LIBOR      
Basis spread on variable rate (in hundredths)     2.05%      
Line of Credit [Member]            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity 2,750.0   $ 2,750.0   $ 2,000.0  
Average outstanding borrowings $ 1,211.3 $ 334.7 $ 904.2 $ 296.7    
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 (in hundredths)     1.05%      
Line of credit, interest rate during period 1.40% 1.20% 1.40% 1.10%    
Covenant terms, minimum cash interest coverage ratio 300.00%   300.00%      
Unamortized Debt Issuance Expense $ 20.7   $ 20.7     $ 15.4