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Derivative and Other Fair Value Instruments - Additional Information (Details)
$ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2020
USD ($)
DerivativeInstrument
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Derivative [Line Items]      
Unrealized gain (loss) on interest rate cash flow hedges, pretax, accumulated other comprehensive income (loss)   $ 67.4 $ 77.6
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net   $ 25.7  
Forward Starting Swaps [Member]      
Derivative [Line Items]      
Payments for settlement of derivative instruments $ 1.2    
Forward starting swaps settled | DerivativeInstrument 2    
Increase (decrease) in charges hedge termination activities $ 1.2    
Mortgage notes period 5 years    
Mortgages [Member] | Forward Starting Swaps [Member]      
Derivative [Line Items]      
Debt instrument face amount $ 495.0    
Secured conventional mortgage notes period 10 years