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Derivatives and Hedging Activities - Interest Rate Swaps and Interest Rate Caps Outstanding (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative asset, notional amount | $ 17.6 | $ 0.0
Derivative liability, notional amount | (66.6) | (61.0)
Derivative notional amount | 1,537.5 | 1,200.0
Pay-fixed swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative asset, notional amount | 435.0 | 0.0
Pay-fixed swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative asset, notional amount | 330.0 | 0.0
Pay-fixed swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative asset, notional amount | 435.0 | 0.0
Interest rate cap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative asset, notional amount | 168.8 | 0.0
Interest rate cap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative asset, notional amount | 168.7 | 0.0
Pay-fixed swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative asset, notional amount | 165.0 | 0.0
Pay-fixed swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative asset, notional amount | 120.0 | 0.0
Pay-fixed swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative asset, notional amount | 150.0 | 0.0
Receive-fixed swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative liability, notional amount | (165.0) | 0.0
Receive-fixed swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative liability, notional amount | (120.0) | 0.0
Receive-fixed swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative liability, notional amount | (150.0) | 0.0
Pay-fixed swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative asset, notional amount | 0.0 | 330.0
Pay-fixed swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative asset, notional amount | 0.0 | 330.0
Pay-fixed swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative asset, notional amount | 0.0 | 240.0
Pay-fixed swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Derivative asset, notional amount | $ 0.0 | $ 300.0

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