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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income $ 71.4 $ 55.5 $ 193.3 $ 173.9
Other comprehensive income, before tax:        
Change in net unrealized gains during the period 38.1 158.5 153.5 134.6
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax 0.1 (0.2) 0.0 (0.5)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 0.0 12.4 1.9 (10.1)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 0.2 3.1 1.6 11.2
Deferred tax expense related to other comprehensive income (9.6) (43.2) (39.2) (33.6)
Other comprehensive income, net of tax 28.8 130.6 117.8 101.6
Other comprehensive income, before tax 38.4 173.8 157.0 135.2
Comprehensive income, net of tax $ 100.2 $ 186.1 $ 311.1 $ 275.5