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Derivatives - Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Beginning of Year $ 0.0 $ (0.4)
Gains (Losses) Deferred in AOCI 1.5 (0.4)
Net Change in AOCI with Current Period Hedging Transactions (1.3) 0.0
Gains (Losses) Reclassified into Income 0.0 (0.5)
Net Comprehensive Gains (Losses) from Cash Flow Hedges $ 0.2 $ (1.3)