Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities Interest Spread on Interest Rate Swaps and Caps (Details)

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Derivative Instruments and Hedging Activities Interest Spread on Interest Rate Swaps and Caps (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Average Notional Amount $ 31,823,176,000 $ 19,953,655,000  
Interest Rate Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net interest expense (income) on interest rate swaps and caps 49,200,000 (8,800,000) $ (21,100,000)
Net Long Position [Member] | Interest Rate Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Average Notional Amount $ 29,400,000,000 $ 19,400,000,000 $ 15,500,000,000