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Stockholders' Equity - Schedule of Components of Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Beginning balance $ 479.0 $ 477.8
Amounts reclassified from AOCL into earnings, net of tax (4.8) (8.1)
Ending balance 397.9 552.8
Investment Securities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Beginning balance (33.0) (69.4)
Unrealized gains/(losses) (3.0) 24.1
Tax benefit/(expense) 0.5 (4.2)
Amounts reclassified from AOCL into earnings, net of tax (2.1) 0.1
Ending balance (37.6) (49.4)
Hedging Activities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Beginning balance (15.3) 20.5
Unrealized gains/(losses) 13.6 (2.2)
Tax benefit/(expense) (0.1) 0.1
Amounts reclassified from AOCL into earnings, net of tax (2.7) (8.2)
Ending balance (4.5) 10.2
Foreign Currency Translation    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Beginning balance (119.0) (119.0)
Ending balance (119.0) (119.0)
Total AOCL    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Beginning balance (167.3) (167.9)
Unrealized gains/(losses) 10.6 21.9
Tax benefit/(expense) 0.4 (4.1)
Amounts reclassified from AOCL into earnings, net of tax (4.8) (8.1)
Ending balance $ (161.1) $ (158.2)