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Business Combinations, Goodwill and Other Intangible Assets, Other Intangibles by Segment (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |
Additions, net of adjustments | $ 119.2 | $ 101.8 |
Adjustment for fully amortized intangibles | (66.9) | (61.4) |
Impact of exchange rate movements | (5.4) | 3.3 |
Intangible Assets, Gross (Excluding Goodwill) | 1,394.9 | 1,348.0 | $ 1,304.3
Identified intangibles, with finite useful lives, accumulated amortization | (670.8) | (563.0) | (445.8)
Amortization expense, net (1) | (176.2) | (177.7) |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 66.9 | 61.4 |
Impact of exchange rate movements | 1.5 | (0.9) |
Net book value as of end of period | 724.1 | 785.0 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 7.7 | 10.0 |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |
2025 | 152.1 |  |
2026 | 115.7 |  |
2027 | 98.8 |  |
2028 | 83.4 |  |
2029 | 66.5 |  |
Thereafter | 160.6 |  |
Total | 677.1 |  |
Mortgage servicing rights [Member] |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |
Additions, net of adjustments | 89.0 | 94.6 |
Adjustment for fully amortized intangibles | (39.7) | (40.1) |
Impact of exchange rate movements | 0.0 | 0.0 |
Intangible Assets, Gross (Excluding Goodwill) | 851.1 | 801.8 | 747.3
Identified intangibles, with finite useful lives, accumulated amortization | (380.0) | (309.8) | (242.2)
Amortization expense, net (1) | (109.9) | (107.7) |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 39.7 | 40.1 |
Impact of exchange rate movements | 0.0 | 0.0 |
Net book value as of end of period | $ 471.1 | 492.0 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years 7 months 6 days |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |
2025 | $ 102.2 |  |
2026 | 90.0 |  |
2027 | 79.1 |  |
2028 | 65.0 |  |
2029 | 48.8 |  |
Thereafter | 86.0 |  |
Total | 471.1 |  |
Other Intangible Assets [Member] |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |
Additions, net of adjustments | 30.2 | 7.2 |
Adjustment for fully amortized intangibles | (27.2) | (21.3) |
Impact of exchange rate movements | (5.4) | 3.3 |
Intangible Assets, Gross (Excluding Goodwill) | 543.8 | 546.2 | 557.0
Identified intangibles, with finite useful lives, accumulated amortization | (290.8) | (253.2) | $ (203.6)
Amortization expense, net (1) | (66.3) | (70.0) |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 27.2 | 21.3 |
Impact of exchange rate movements | 1.5 | $ (0.9) |
Net book value as of end of period | $ 253.0 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 4 years 7 months 6 days |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |
2025 | $ 49.9 |  |
2026 | 25.7 |  |
2027 | 19.7 |  |
2028 | 18.4 |  |
2029 | 17.7 |  |
Thereafter | 74.6 |  |
Total | $ 206.0 |  |

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