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Derivatives - Derivatives Presented on a Net Asset and Net Liability basis (Details) - Interest rate swaps - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Assets    
Gross Amounts on Balance Sheet $ 115.0 $ 124.8
Effects of Counterparty Netting (41.9) (56.4)
Net Amounts 73.1 68.4
Liabilities    
Gross Amounts on Balance Sheet 41.9 56.4
Effects of Counterparty Netting (41.9) (56.4)
Net Amounts $ 0.0 $ 0.0