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Stockholders' Equity - Schedule of Components of Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance $ 355.6 $ 186.6 $ (39.5)
Amounts reclassified from AOCL into earnings, net of tax (57.9) 98.6 8.2
Ending balance 477.8 355.6 186.6
Investment Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance 30.4 58.3 24.7
Unrealized gains/(losses) (130.8) (31.0) 41.5
Tax benefit/(expense) 23.8 6.0 (7.4)
Amounts reclassified from AOCL into earnings, net of tax 7.2 (2.9) (0.5)
Ending balance (69.4) 30.4 58.3
Hedging Activities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance 18.7 (30.5) (3.6)
Unrealized gains/(losses) 49.5 42.9 (26.4)
Tax benefit/(expense) (0.4) (1.2) 0.2
Amounts reclassified from AOCL into earnings, net of tax (47.3) 7.5 (0.7)
Ending balance 20.5 18.7 (30.5)
Foreign Currency Translation      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance (101.2) (101.2) (101.2)
Amounts reclassified from AOCL into earnings, net of tax (17.8)    
Ending balance (119.0) (101.2) (101.2)
Defined benefit plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance   (86.1) (128.9)
Unrealized gains/(losses)   (8.7) 43.5
Tax benefit/(expense)   0.8 (10.1)
Amounts reclassified from AOCL into earnings, net of tax   94.0 9.4
Ending balance     (86.1)
Total AOCL      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance (52.1) (159.5) (209.0)
Unrealized gains/(losses) (81.3) 3.2 58.6
Tax benefit/(expense) 23.4 5.6 (17.3)
Amounts reclassified from AOCL into earnings, net of tax (57.9) 98.6 8.2
Ending balance $ (167.9) $ (52.1) $ (159.5)