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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | $ 772.1 |  |  |
Identifiable intangibles with indefinite useful lives | 49.0 |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 51.3 | $ 83.0 |  |
Adjustment for fully amortized intangibles | 37.6 | 36.3 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 2.1 | (7.7) |  |
Intangible Assets, Gross (Excluding Goodwill) | 1,320.1 | 1,266.1 | $ 1,304.3 | $ 1,227.1
Identified intangibles, with finite useful lives, accumulated amortization | (499.0) | (394.2) | (445.8) | (340.1)
Amortization expense | (90.1) | (92.5) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (37.6) | (36.3) |  |
Impact of exchange rate movements | (0.7) | 2.1 |  |
Net book value as of end of period | 821.1 | 871.9 | 858.5 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 6.8 | 16.7 |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
Total | 772.1 |  |  |
Mortgage servicing rights [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 45.5 | 78.1 |  |
Adjustment for fully amortized intangibles | 20.2 | 33.8 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 772.6 | 714.0 | 747.3 | 669.7
Identified intangibles, with finite useful lives, accumulated amortization | (276.5) | (216.0) | (242.2) | (191.0)
Amortization expense | (54.5) | (58.8) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (20.2) | (33.8) |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 496.1 | 498.0 |  |
Other Intangible Assets [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 5.8 | 4.9 |  |
Adjustment for fully amortized intangibles | 17.4 | 2.5 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 2.1 | (7.7) |  |
Intangible Assets, Gross (Excluding Goodwill) | 547.5 | 552.1 | 557.0 | 557.4
Identified intangibles, with finite useful lives, accumulated amortization | (222.5) | (178.2) | $ (203.6) | $ (149.1)
Amortization expense | (35.6) | (33.7) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (17.4) | (2.5) |  |
Impact of exchange rate movements | (0.7) | 2.1 |  |
Net book value as of end of period | $ 325.0 | $ 373.9 |  |

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