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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Document Period End Date | Jun. 30, 2021 |  |  |
Finite and Indefinite lived Intangible Assets, Additions | $ 65.7 | $ 43.5 |  |
Adjustment for fully amortized intangibles | 46.0 | 26.7 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (1.6) | 4.4 |  |
Intangible Assets, Gross (Excluding Goodwill) | 993.2 | 909.8 | $ 975.1 | $ 897.4
Identified intangibles, with finite useful lives, accumulated amortization | (320.7) | (256.9) | (295.3) | (214.8)
Amortization expense | (71.2) | (71.4) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (46.0) | (26.7) |  |
Impact of exchange rate movements | (0.2) | (2.6) |  |
Net book value as of end of period | 672.5 | 652.9 | 679.8 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 7.6 | 9.3 |  |
Valuation Allowance for Impairment of Recognized Servicing Assets, Deductions for Aggregate Write-Downs |  | 2.8 |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
Total | 620.0 |  |  |
Identifiable intangibles with indefinite useful lives | 52.5 |  |  |
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 | 61.9 | 43.0 |  |
Adjustment for fully amortized intangibles | 17.2 | 20.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 616.8 | 503.4 | 572.1 | 480.4
Identified intangibles, with finite useful lives, accumulated amortization | (175.5) | (126.5) | (147.8) | (104.0)
Amortization expense | (44.9) | (42.5) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (17.2) | (20.0) |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 441.3 | 376.9 |  |
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 | 0.0 | 0.0 |  |
Adjustment for fully amortized intangibles | 9.0 | 6.2 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.4 |  |
Intangible Assets, Gross (Excluding Goodwill) | 256.8 | 279.1 | 265.8 | 285.7
Identified intangibles, with finite useful lives, accumulated amortization | (105.9) | (85.2) | (94.1) | (68.3)
Amortization expense | (20.7) | (23.4) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (9.0) | (6.2) |  |
Impact of exchange rate movements | (0.1) | 0.3 |  |
Net book value as of end of period | 150.9 | 193.9 |  |
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 | 16.1 | 0.5 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.3 | 3.5 |  |
Intangible Assets, Gross (Excluding Goodwill) | 43.7 | 51.9 | 55.7 | 55.9
Identified intangibles, with finite useful lives, accumulated amortization | (27.6) | (33.9) | (39.5) | (33.1)
Amortization expense | (4.0) | (3.5) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (16.1) | (0.5) |  |
Impact of exchange rate movements | (0.2) | (2.2) |  |
Net book value as of end of period | 16.1 | 18.0 |  |
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 | 3.7 | 0.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (0.5) | 0.4 |  |
Intangible Assets, Gross (Excluding Goodwill) | 19.4 | 21.5 | 23.6 | 21.4
Identified intangibles, with finite useful lives, accumulated amortization | (5.5) | (7.3) | (8.6) | (6.7)
Amortization expense | (0.7) | (0.7) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (3.7) | 0.0 |  |
Impact of exchange rate movements | 0.1 | (0.1) |  |
Net book value as of end of period | 13.9 | 14.2 |  |
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 | (1.4) | 0.1 |  |
Intangible Assets, Gross (Excluding Goodwill) | 56.5 | 53.9 | 57.9 | 54.0
Identified intangibles, with finite useful lives, accumulated amortization | (6.2) | (4.0) | $ (5.3) | $ (2.7)
Amortization expense | (0.9) | (1.3) |  |
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 | $ 50.3 | $ 49.9 |  |

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