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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | $ 714.0 |  |  |
Identifiable intangibles with indefinite useful lives | 48.6 |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 21.9 | $ 17.3 |  |
Adjustment for fully amortized intangibles | (14.5) | (9.4) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (2.2) | 1.3 |  |
Intangible Assets, Gross (Excluding Goodwill) | 1,353.2 | 1,313.5 | $ 1,348.0 | $ 1,304.3
Identified intangibles, with finite useful lives, accumulated amortization | (590.6) | (480.4) | (563.0) | (445.8)
Amortization expense | (42.7) | (43.6) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 14.5 | 9.4 |  |
Impact of exchange rate movements | 0.6 | (0.4) |  |
Net book value as of end of period | 762.6 | 833.1 | 785.0 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 1.6 | 2.9 |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
Total | 714.0 |  |  |
Mortgage servicing rights [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 21.9 | 17.3 |  |
Adjustment for fully amortized intangibles | (5.3) | (9.0) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 818.4 | 755.6 | 801.8 | 747.3
Identified intangibles, with finite useful lives, accumulated amortization | (331.0) | (259.3) | (309.8) | (242.2)
Amortization expense | (26.5) | (26.1) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 5.3 | 9.0 |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 487.4 | 496.3 |  |
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 | (9.2) | (0.4) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (2.2) | 1.3 |  |
Intangible Assets, Gross (Excluding Goodwill) | 534.8 | 557.9 | 546.2 | 557.0
Identified intangibles, with finite useful lives, accumulated amortization | (259.6) | (221.1) | $ (253.2) | $ (203.6)
Amortization expense | (16.2) | (17.5) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 9.2 | 0.4 |  |
Impact of exchange rate movements | 0.6 | (0.4) |  |
Net book value as of end of period | $ 275.2 | $ 336.8 |  |

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