Derivative Instruments (Interest Rate Caps and Collars) (Details) $ in Millions |
Dec. 31, 2019
USD ($)
|
|---|---|
| Interest Rate Cap | |
| Derivative [Line Items] | |
| Notional amount | $ 1,107.4 |
| Interest Rate Collar | |
| Derivative [Line Items] | |
| Notional amount | $ 1,246.4 |