Derivatives and Hedging Activities - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative [Line Items]
Reclassification of previous unrealized loss on interest rate derivatives into net income	$ 5,441,000	$ 656,000	$ 11,995,000	$ 870,000
Gain (loss) to be reclassified in next twelve months	21,700,000		21,700,000
Cash Flow Hedging [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in income on cash flow hedges	3,700,000	(20,900,000)	(81,400,000)	(48,500,000)
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	900,000,000.0		900,000,000.0
Designated as Hedging Instrument [Member] | Forward Starting Interest Rate [Member]
Derivative [Line Items]
Notional amount	400,000,000.0		400,000,000.0
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Reclassification of previous unrealized loss on interest rate derivatives into net income	$ 5,400,000	$ 700,000	$ 12,000,000.0	$ 900,000