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Stockholders' Equity - Schedule of Components of Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance $ 186.6 $ (39.5) $ (309.8)
Amounts reclassified from AOCL into earnings, net of tax 98.6 8.2 (6.2)
Ending balance 355.6 186.6 (39.5)
Investment Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance 58.3 24.7 (1.1)
Unrealized gains/(losses) (31.0) 41.5 33.6
Tax benefit/(expense) 6.0 (7.4) (7.3)
Amounts reclassified from AOCL into earnings, net of tax (2.9) (0.5) (0.5)
Ending balance 30.4 58.3 24.7
Hedging Activities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance (30.5) (3.6) 7.4
Unrealized gains/(losses) 42.9 (26.4) 2.0
Tax benefit/(expense) (1.2) 0.2 1.1
Amounts reclassified from AOCL into earnings, net of tax 7.5 (0.7) (14.1)
Ending balance 18.7 (30.5) (3.6)
Foreign Currency Translation      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance (101.2) (101.2) (101.2)
Ending balance (101.2) (101.2) (101.2)
Defined benefit plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance (86.1) (128.9) (136.1)
Unrealized gains/(losses) (8.7) 43.5 (2.0)
Tax benefit/(expense) 0.8 (10.1) 0.8
Amounts reclassified from AOCL into earnings, net of tax 94.0 9.4 8.4
Ending balance   (86.1) (128.9)
Total AOCL      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Beginning balance (159.5) (209.0) (231.0)
Unrealized gains/(losses) 3.2 58.6 33.6
Tax benefit/(expense) 5.6 (17.3) (5.4)
Amounts reclassified from AOCL into earnings, net of tax 98.6 8.2 (6.2)
Ending balance $ (52.1) $ (159.5) $ (209.0)