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Credit Facility (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Line of Credit Facility [Line Items]      
Long-term Line of Credit, Noncurrent, Net of Debt Issuance Costs $ 510.0   $ (15.9)
Line of Credit Facility, Maximum Borrowing Capacity 63.1    
Letters of Credit Outstanding, Amount 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 510.0   $ (15.9)
Line of Credit Facility, Maximum Borrowing Capacity 2,750.0    
Line of Credit Facility, Average Outstanding Amount $ 209.0 $ 202.3  
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% 2.60%