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Business Combinations, Goodwill and Other Intangible Assets, Other Intangibles by Segment (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |
Additions, net of adjustments | $ 101.8 | $ 160.2 |
Adjustment for fully amortized intangibles | (61.4) | (76.8) |
Impact of exchange rate movements | 3.3 | (6.2) |
Intangible Assets, Gross (Excluding Goodwill) | 1,348.0 | 1,304.3 | $ 1,227.1
Identified intangibles, with finite useful lives, accumulated amortization | (563.0) | (445.8) | (340.1)
Amortization expense, net (1) | (177.7) | (184.8) |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 61.4 | 76.8 |
Impact of exchange rate movements | (0.9) | (2.3) |
Net book value as of end of period | 785.0 | 858.5 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 10.0 | 28.0 |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |
2024 | 161.7 |  |
2025 | 132.6 |  |
2026 | 96.0 |  |
2027 | 79.1 |  |
2028 | 65.4 |  |
Thereafter | 200.6 |  |
Total | 735.4 |  |
Mortgage servicing rights [Member] |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |
Additions, net of adjustments | 94.6 | 140.9 |
Adjustment for fully amortized intangibles | (40.1) | (63.3) |
Impact of exchange rate movements | 0.0 | 0.0 |
Intangible Assets, Gross (Excluding Goodwill) | 801.8 | 747.3 | 669.7
Identified intangibles, with finite useful lives, accumulated amortization | (309.8) | (242.2) | (191.0)
Amortization expense, net (1) | (107.7) | (114.5) |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 40.1 | 63.3 |
Impact of exchange rate movements | 0.0 | 0.0 |
Net book value as of end of period | $ 492.0 | 505.1 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years 10 months 24 days |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |
2024 | $ 97.4 |  |
2025 | 88.7 |  |
2026 | 75.9 |  |
2027 | 64.4 |  |
2028 | 51.0 |  |
Thereafter | 114.6 |  |
Total | 492.0 |  |
Other Intangible Assets [Member] |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |
Additions, net of adjustments | 7.2 | 19.3 |
Adjustment for fully amortized intangibles | (21.3) | (13.5) |
Impact of exchange rate movements | 3.3 | (6.2) |
Intangible Assets, Gross (Excluding Goodwill) | 546.2 | 557.0 | 557.4
Identified intangibles, with finite useful lives, accumulated amortization | (253.2) | (203.6) | $ (149.1)
Amortization expense, net (1) | (70.0) | (70.3) |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 21.3 | 13.5 |
Impact of exchange rate movements | (0.9) | $ 2.3 |
Net book value as of end of period | $ 293.0 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 4 years 7 months 6 days |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |
2024 | $ 64.3 |  |
2025 | 43.9 |  |
2026 | 20.1 |  |
2027 | 14.7 |  |
2028 | 14.4 |  |
Thereafter | 86.0 |  |
Total | $ 243.4 |  |

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