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Credit Facility (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Line of Credit Facility [Line Items]          
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs $ 485.9   $ 485.9   $ (15.9)
Line of Credit Facility, Maximum Borrowing Capacity 70.6   70.6    
Letters of Credit Outstanding, Amount 0.5 $ 8.6 0.5 $ 8.6  
Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs 485.9   485.9   $ (15.9)
Line of Credit Facility, Maximum Borrowing Capacity 2,750.0   2,750.0    
Line of Credit Facility, Average Outstanding Amount $ 661.1 $ 523.0 $ 436.3 $ 363.5  
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 (in hundredths)     0.95%    
Line of Credit Facility, Interest Rate During Period 3.30% 2.80% 3.30% 2.70%