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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | $ 653.2 |  |  |
Identifiable intangibles with indefinite useful lives | 48.6 |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 20.2 | $ 21.9 |  |
Adjustment for fully amortized intangibles | (11.7) | (14.5) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 2.7 | (2.2) |  |
Intangible Assets, Gross (Excluding Goodwill) | 1,406.1 | 1,353.2 | $ 1,394.9 | $ 1,348.0
Identified intangibles, with finite useful lives, accumulated amortization | (704.3) | (590.6) | (670.8) | (563.0)
Amortization expense | (44.2) | (42.7) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 11.7 | 14.5 |  |
Impact of exchange rate movements | (1.0) | 0.6 |  |
Net book value as of end of period | 701.8 | 762.6 | 724.1 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 0.8 | 1.6 |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
Total | 653.2 |  |  |
Mortgage servicing rights [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 20.2 | 21.9 |  |
Adjustment for fully amortized intangibles | (11.7) | (5.3) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 859.6 | 818.4 | 851.1 | 801.8
Identified intangibles, with finite useful lives, accumulated amortization | (395.5) | (331.0) | (380.0) | (309.8)
Amortization expense | (27.2) | (26.5) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 11.7 | 5.3 |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 464.1 | 487.4 |  |
Other Intangible Assets [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 0.0 | 0.0 |  |
Adjustment for fully amortized intangibles | 0.0 | (9.2) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 2.7 | (2.2) |  |
Intangible Assets, Gross (Excluding Goodwill) | 546.5 | 534.8 | 543.8 | 546.2
Identified intangibles, with finite useful lives, accumulated amortization | (308.8) | (259.6) | $ (290.8) | $ (253.2)
Amortization expense | (17.0) | (16.2) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 | 9.2 |  |
Impact of exchange rate movements | (1.0) | 0.6 |  |
Net book value as of end of period | $ 237.7 | $ 275.2 |  |

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