Debt - Outstanding Debt (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Excluding Impact | Variable Rate Debt
Debt Instrument [Line Items]
Debt Instrument, Carrying Value	$ 2,446,786
Debt, Percentage Interest Rate Remaining Term	3 years 1 month 6 days
Excluding Impact | Fixed Rate Debt
Debt Instrument [Line Items]
Debt, Percentage Interest Rate Remaining Term	4 years 3 months 18 days
Including Impact
Debt Instrument [Line Items]
Debt Instrument, Carrying Value	$ 6,469,935
Contractual Weighted Avg Interest Rate	3.15%
Including Impact | Variable Rate Debt
Debt Instrument [Line Items]
Contractual Weighted Avg Interest Rate	1.72%
Including Impact | Fixed Rate Debt
Debt Instrument [Line Items]
Debt Instrument, Carrying Value	$ 4,023,149
Contractual Weighted Avg Interest Rate	3.19%
Including Impact | Hedged Debt
Debt Instrument [Line Items]
Debt Instrument, Carrying Value	$ 1,805,599
Designated as Hedging Instrument | Including Impact | Fixed and Hedged Debt
Debt Instrument [Line Items]
Debt Instrument, Carrying Value	$ 5,828,748
Contractual Weighted Avg Interest Rate	3.31%
Designated as Hedging Instrument | Including Impact | Hedged Debt
Debt Instrument [Line Items]
Contractual Weighted Avg Interest Rate	3.56%
Not Designated as Hedging Instrument | Including Impact | Unhedged Debt
Debt Instrument [Line Items]
Debt Instrument, Carrying Value	$ 641,187