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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Document Period End Date | Sep. 30, 2021 |  |  |
Finite and Indefinite lived Intangible Assets, Additions | $ 115.0 | $ 78.4 |  |
Adjustment for fully amortized intangibles | 82.2 | 45.4 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (4.3) | (0.5) |  |
Intangible Assets, Gross (Excluding Goodwill) | 1,003.6 | 930.9 | $ 975.1 | $ 897.4
Identified intangibles, with finite useful lives, accumulated amortization | (323.0) | (277.0) | (295.3) | (214.8)
Amortization expense | (110.6) | (108.8) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (82.2) | (45.4) |  |
Impact of exchange rate movements | 0.7 | (1.2) |  |
Net book value as of end of period | 680.6 | 653.9 | 679.8 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 15.4 | 15.3 |  |
Valuation Allowance for Impairment of Recognized Servicing Assets, Deductions for Aggregate Write-Downs |  | 1.9 |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
Total | 629.1 |  |  |
Identifiable intangibles with indefinite useful lives | 51.5 |  |  |
Mortgage servicing rights [Member] | Americas [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 95.5 | 77.9 |  |
Adjustment for fully amortized intangibles | 36.2 | 30.9 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 631.4 | 527.4 | 572.1 | 480.4
Identified intangibles, with finite useful lives, accumulated amortization | (183.5) | (138.6) | (147.8) | (104.0)
Amortization expense | (71.9) | (65.5) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (36.2) | (30.9) |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 447.9 | 388.8 |  |
Other Intangible Assets [Member] | Americas [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 15.7 | 0.0 |  |
Adjustment for fully amortized intangibles | 11.4 | 14.1 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.2 |  |
Intangible Assets, Gross (Excluding Goodwill) | 270.1 | 271.4 | 265.8 | 285.7
Identified intangibles, with finite useful lives, accumulated amortization | (113.8) | (88.8) | (94.1) | (68.3)
Amortization expense | (31.1) | (35.0) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (11.4) | (14.1) |  |
Impact of exchange rate movements | 0.0 | 0.4 |  |
Net book value as of end of period | 156.3 | 182.6 |  |
Other Intangible Assets [Member] | EMEA [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 3.8 | 0.0 |  |
Adjustment for fully amortized intangibles | 29.9 | 0.4 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (0.7) | 1.5 |  |
Intangible Assets, Gross (Excluding Goodwill) | 28.9 | 54.0 | 55.7 | 55.9
Identified intangibles, with finite useful lives, accumulated amortization | (14.5) | (37.0) | (39.5) | (33.1)
Amortization expense | (5.3) | (5.2) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (29.9) | (0.4) |  |
Impact of exchange rate movements | 0.4 | (0.9) |  |
Net book value as of end of period | 14.4 | 17.0 |  |
Other Intangible Assets [Member] | Asia Pacific [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 0.0 | 0.5 |  |
Adjustment for fully amortized intangibles | 4.7 | 0.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (1.1) | (0.3) |  |
Intangible Assets, Gross (Excluding Goodwill) | 17.8 | 22.2 | 23.6 | 21.4
Identified intangibles, with finite useful lives, accumulated amortization | (4.6) | (7.9) | (8.6) | (6.7)
Amortization expense | (1.0) | (1.1) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (4.7) | 0.0 |  |
Impact of exchange rate movements | 0.3 | 0.1 |  |
Net book value as of end of period | 13.2 | 14.3 |  |
Other Intangible Assets [Member] | Investment Management [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 | 0.0 | 0.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (2.5) | (1.9) |  |
Intangible Assets, Gross (Excluding Goodwill) | 55.4 | 55.9 | 57.9 | 54.0
Identified intangibles, with finite useful lives, accumulated amortization | (6.6) | (4.7) | $ (5.3) | $ (2.7)
Amortization expense | (1.3) | (2.0) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 | 0.0 |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | $ 48.8 | $ 51.2 |  |

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