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Credit Facility (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Line of Credit Facility [Line Items]          
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs $ 336.7   $ 336.7   $ (8.7)
Line of Credit Facility, Maximum Borrowing Capacity 64.9   64.9    
Letters of Credit Outstanding, Amount 0.7   0.7   0.7
Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Unamortized Debt Issuance Expense 13.3   13.3   8.7
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs 336.7   336.7   $ (8.7)
Line of Credit Facility, Maximum Borrowing Capacity 2,750.0   2,750.0    
Line of Credit Facility, Average Outstanding Amount $ 612.5 $ 1,351.5 $ 399.6 $ 1,143.4  
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 1.00% 1.40% 1.00% 1.80%