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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 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 | $ 630.0 |  |  |
Identifiable intangibles with indefinite useful lives | 52.0 |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 41.1 | $ 49.1 |  |
Adjustment for fully amortized intangibles | (25.7) | (24.8) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 10.0 | (2.5) |  |
Intangible Assets, Gross (Excluding Goodwill) | 1,420.3 | 1,369.8 | $ 1,394.9 | $ 1,348.0
Identified intangibles, with finite useful lives, accumulated amortization | (738.3) | (625.9) | (670.8) | (563.0)
Amortization expense | (89.4) | (88.3) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 25.7 | 24.8 |  |
Impact of exchange rate movements | (3.8) | 0.6 |  |
Net book value as of end of period | 682.0 | 743.9 | 724.1 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 2.3 | 4.2 |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
Total | 630.0 |  |  |
Mortgage servicing rights [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 40.6 | 34.2 |  |
Adjustment for fully amortized intangibles | (24.5) | (15.5) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 867.2 | 820.5 | 851.1 | 801.8
Identified intangibles, with finite useful lives, accumulated amortization | (410.9) | (349.7) | (380.0) | (309.8)
Amortization expense | (55.4) | (55.4) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 24.5 | 15.5 |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 456.3 | 470.8 |  |
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 | 14.9 |  |
Adjustment for fully amortized intangibles | (1.2) | (9.3) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 10.0 | (2.5) |  |
Intangible Assets, Gross (Excluding Goodwill) | 553.1 | 549.3 | 543.8 | 546.2
Identified intangibles, with finite useful lives, accumulated amortization | (327.4) | (276.2) | $ (290.8) | $ (253.2)
Amortization expense | (34.0) | (32.9) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 1.2 | 9.3 |  |
Impact of exchange rate movements | (3.8) | 0.6 |  |
Net book value as of end of period | $ 225.7 | $ 273.1 |  |

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