Derivatives - Derivatives Presented on a Net Asset and Net Liability basis (Details) - Interest rate swaps - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets
Gross Amounts on Balance Sheet	$ 34.7	$ 46.2
Effects of Counterparty Netting	(16.0)	(20.3)
Net Amounts	0.0	0.0
Liabilities
Gross Amounts on Balance Sheet	16.0	20.3
Effects of Counterparty Netting	(16.0)	(20.3)
Net Amounts	$ 18.7	$ 25.9