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Credit Facility (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Line of Credit Facility [Line Items]          
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs $ 1,111.7   $ 1,111.7   $ (15.9)
Line of Credit Facility, Maximum Borrowing Capacity 70.0   70.0    
Letters of Credit Outstanding, Amount 0.8   0.8   8.6
Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs 1,111.7   1,111.7   $ (15.9)
Line of Credit Facility, Maximum Borrowing Capacity 2,750.0   2,750.0    
Line of Credit Facility, Average Outstanding Amount $ 1,408.5 $ 461.5 $ 763.9 $ 396.5  
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 3.10% 3.00% 3.20% 2.80%