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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative assets	$ 1,287.5	$ 1,256.9
Counterparty Credit Risk
Derivative [Line Items]
Derivative assets	394.0
Interest Rate Caps
Derivative [Line Items]
Notional amount	1,200.0
Interest Rate Collars
Derivative [Line Items]
Notional amount	4,500.0
Foreign currency forward and option contracts
Derivative [Line Items]
Derivative assets	10.8	$ 2.9
Notional amount	$ 1,600.0

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