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Stockholders' Equity - Schedule of Components of Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance $ 477.8 $ 355.6 $ 186.6
Amounts reclassified from AOCL into earnings, net of tax (18.2) (57.9) 98.6
Ending balance 479.0 477.8 355.6
Investment Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance (69.4) 30.4 58.3
Unrealized gains/(losses) 37.3 (130.8) (31.0)
Tax benefit/(expense) (6.5) 23.8 6.0
Amounts reclassified from AOCL into earnings, net of tax 5.6 7.2 (2.9)
Ending balance (33.0) (69.4) 30.4
Hedging Activities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance 20.5 18.7 (30.5)
Unrealized gains/(losses) (12.1) 49.5 42.9
Tax benefit/(expense) 0.1 (0.4) (1.2)
Amounts reclassified from AOCL into earnings, net of tax (23.8) (47.3) 7.5
Ending balance (15.3) 20.5 18.7
Foreign Currency Translation      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance (119.0) (101.2) (101.2)
Amounts reclassified from AOCL into earnings, net of tax   (17.8)  
Ending balance (119.0) (119.0) (101.2)
Defined benefit plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance     (86.1)
Unrealized gains/(losses)     (8.7)
Tax benefit/(expense)     0.8
Amounts reclassified from AOCL into earnings, net of tax     94.0
Total AOCL      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance (167.9) (52.1) (159.5)
Unrealized gains/(losses) 25.2 (81.3) 3.2
Tax benefit/(expense) (6.4) 23.4 5.6
Amounts reclassified from AOCL into earnings, net of tax (18.2) (57.9) 98.6
Ending balance $ (167.3) $ (167.9) $ (52.1)