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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | $ 824.6 |  |  |
Identifiable intangibles with indefinite useful lives | 47.3 |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 83.0 | $ 65.7 |  |
Adjustment for fully amortized intangibles | 36.3 | 46.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (7.7) | (1.6) |  |
Intangible Assets, Gross (Excluding Goodwill) | 1,266.1 | 993.2 | $ 1,227.1 | $ 975.1
Identified intangibles, with finite useful lives, accumulated amortization | (394.2) | (320.7) | (340.1) | (295.3)
Amortization expense | (92.5) | (71.2) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (36.3) | (46.0) |  |
Impact of exchange rate movements | 2.1 | 0.2 |  |
Net book value as of end of period | 871.9 | 672.5 | 887.0 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 16.7 | 7.6 |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
Total | 824.6 |  |  |
Mortgage servicing rights [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 78.1 | 61.9 |  |
Adjustment for fully amortized intangibles | 33.8 | 17.2 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 714.0 | 616.8 | 669.7 | 572.1
Identified intangibles, with finite useful lives, accumulated amortization | (216.0) | (175.5) | (191.0) | (147.8)
Amortization expense | (58.8) | (44.9) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (33.8) | (17.2) |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 498.0 | 441.3 |  |
Other Intangible Assets [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 4.9 | 3.8 |  |
Adjustment for fully amortized intangibles | 2.5 | 28.8 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (7.7) | (1.6) |  |
Intangible Assets, Gross (Excluding Goodwill) | 552.1 | 376.4 | 557.4 | 403.0
Identified intangibles, with finite useful lives, accumulated amortization | (178.2) | (145.2) | $ (149.1) | $ (147.5)
Amortization expense | (33.7) | (26.3) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (2.5) | (28.8) |  |
Impact of exchange rate movements | 2.1 | 0.2 |  |
Net book value as of end of period | $ 373.9 | $ 231.2 |  |

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