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Stockholders' Equity - Schedule of Components of Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                
Beginning balance $ 883.6 $ 939.4 $ 968.9 $ 440.8 $ 397.9 $ 479.0 $ 968.9 $ 479.0
Amounts reclassified from AOCL into earnings, net of tax 2.3     2.1     3.2 (3.3)
Ending balance 925.4 883.6 939.4 652.7 440.8 397.9 925.4 652.7
Investment Securities                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                
Beginning balance (13.2) (16.1) (33.4) (38.8) (37.6) (33.0) (33.4) (33.0)
Unrealized gains/(losses) 15.0 3.4 22.0 40.8 (2.5) (3.0)    
Tax benefit/(expense) (2.9) (0.5) (3.8) (7.2) 0.5 0.5    
Amounts reclassified from AOCL into earnings, net of tax     (0.9) 0.1 0.8 (2.1) (0.9) (1.2)
Ending balance (1.1) (13.2) (16.1) (5.1) (38.8) (37.6) (1.1) (5.1)
Hedging Activities                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                
Beginning balance (51.7) (6.7) 13.1 (4.3) (4.5) (15.3) 13.1 (15.3)
Unrealized gains/(losses) 8.6 (52.7) (19.1) (17.8) 1.6 13.6    
Tax benefit/(expense)   3.3 1.9 1.4   (0.1)    
Amounts reclassified from AOCL into earnings, net of tax 2.3 4.4 (2.6) 2.0 (1.4) (2.7) 4.1 (2.1)
Ending balance (40.8) (51.7) (6.7) (18.7) (4.3) (4.5) (40.8) (18.7)
Foreign Currency Translation                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                
Beginning balance (112.4) (119.1) (120.2) (119.0) (119.0) (119.0) (120.2) (119.0)
Unrealized gains/(losses) (1.9) 6.7 1.1 1.3        
Ending balance (114.3) (112.4) (119.1) (117.7) (119.0) (119.0) (114.3) (117.7)
Total AOCL                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]                
Beginning balance (177.3) (141.9) (140.5) (162.1) (161.1) (167.3) (140.5) (167.3)
Unrealized gains/(losses) 21.7 (42.6) 4.0 24.3 (0.9) 10.6    
Tax benefit/(expense) (2.9) 2.8 (1.9) (5.8) 0.5 0.4    
Amounts reclassified from AOCL into earnings, net of tax 2.3 4.4 (3.5) 2.1 (0.6) (4.8)    
Ending balance $ (156.2) $ (177.3) $ (141.9) $ (141.5) $ (162.1) $ (161.1) $ (156.2) $ (141.5)