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Derivative Instruments - Interest Rate Swap/Caps (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Interest Rate Swap [Member]    
Fair Value of Derivative Instruments    
Net Notional Amount of Interest Rate During Period   2.00%
Weighted Average Remaining Term   5 years 3 months 18 days
Interest Rate Cap [Member]    
Fair Value of Derivative Instruments    
Net Notional Amount of Interest Rate Agreements $ 200.0 $ 200.0
Derivative, Cap Interest Rate 5.50% 5.50%
Weighted Average Remaining Term   1 year 6 months
Designated as Hedging Instrument [Member] | Interest Rate Swap and Cap [Member]    
Fair Value of Derivative Instruments    
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months   $ 30.6
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]    
Fair Value of Derivative Instruments    
Net Notional Amount of Interest Rate Agreements $ 1,823.0 $ 1,823.0
Designated as Hedging Instrument [Member] | Forward Starting Swaps [Member]    
Fair Value of Derivative Instruments    
Weighted Average Remaining Term   6 years 3 months 18 days
Total Notional Amount Forward Starting Interest Rate Swap $ 350.0 $ 350.0
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap [Member]    
Fair Value of Derivative Instruments    
Net Notional Amount of Interest Rate During Period 0.35%  
London Interbank Offered Rate (LIBOR) [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]    
Fair Value of Derivative Instruments    
Net Notional Amount of Interest Rate Agreements $ 125.0 $ 125.0