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Other Comprehensive Income - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Change in net unrealized loss during period $ (613.1) $ (113.7) $ 61.8  
Reclassification adjustment for net gains included in net income 24.4 (1.1) (0.3)  
Accumulated other comprehensive income (loss) 3,073.8 1,986.6 $ 1,959.8 $ 2,013.9
Net unrealized loss on investment securities available-for-sale        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) $ (471.0) $ (29.0)