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Credit Facility (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Line of Credit Facility [Line Items]      
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs $ 1,438.6   $ 512.7
Line of Credit Facility, Maximum Borrowing Capacity 86.0    
Letters of Credit Outstanding, Amount 0.7   0.8
Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs 1,438.6   $ 512.7
Line of Credit Facility, Maximum Borrowing Capacity 2,750.0    
Line of Credit Facility, Average Outstanding Amount $ 935.2 $ 209.0  
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 2.40% 3.30%