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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | $ 619.3 |  |  |
Identifiable intangibles with indefinite useful lives | 52.1 |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 72.6 | $ 67.5 |  |
Adjustment for fully amortized intangibles | (259.1) | (35.2) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 9.7 | 1.8 |  |
Intangible Assets, Gross (Excluding Goodwill) | 1,218.1 | 1,382.1 | $ 1,394.9 | $ 1,348.0
Identified intangibles, with finite useful lives, accumulated amortization | (546.7) | (661.0) | (670.8) | (563.0)
Amortization expense | (131.3) | (132.1) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 259.1 | 35.2 |  |
Impact of exchange rate movements | (3.7) | (1.1) |  |
Net book value as of end of period | 671.4 | 721.1 | 724.1 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 5.8 | 6.0 |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
Total | 619.3 |  |  |
Mortgage servicing rights [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 72.1 | 52.0 |  |
Adjustment for fully amortized intangibles | (41.0) | (25.3) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 882.2 | 828.5 | 851.1 | 801.8
Identified intangibles, with finite useful lives, accumulated amortization | (426.4) | (367.1) | (380.0) | (309.8)
Amortization expense | (87.4) | (82.6) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 41.0 | 25.3 |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 455.8 | 461.4 |  |
Other Intangible Assets [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 0.5 | 15.5 |  |
Adjustment for fully amortized intangibles | (218.1) | (9.9) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 9.7 | 1.8 |  |
Intangible Assets, Gross (Excluding Goodwill) | 335.9 | 553.6 | 543.8 | 546.2
Identified intangibles, with finite useful lives, accumulated amortization | (120.3) | (293.9) | $ (290.8) | $ (253.2)
Amortization expense | (43.9) | (49.5) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 218.1 | 9.9 |  |
Impact of exchange rate movements | (3.7) | (1.1) |  |
Net book value as of end of period | $ 215.6 | $ 259.7 |  |

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