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Credit Facility (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Line of Credit Facility [Line Items]          
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs $ 390.4   $ 390.4   $ 512.7
Line of Credit Facility, Maximum Borrowing Capacity 85.9   85.9    
Letters of Credit Outstanding, Amount 0.7   0.7   0.8
Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Unamortized Debt Issuance Expense 9.6   9.6   12.3
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs 390.4   390.4   $ 512.7
Line of Credit Facility, Maximum Borrowing Capacity 2,750.0   2,750.0    
Line of Credit Facility, Average Outstanding Amount $ 758.9 $ 1,408.5 $ 1,014.3 $ 763.9  
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 1.10% 3.10% 1.60% 3.20%