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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Document Period End Date | Mar. 31, 2021 |  |  |
Finite and Indefinite lived Intangible Assets, Additions | $ 43.8 | $ 17.4 |  |
Adjustment for fully amortized intangibles | 17.7 | 12.9 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (1.9) | 7.1 |  |
Intangible Assets, Gross (Excluding Goodwill) | 999.3 | 894.8 | $ 975.1 | $ 897.4
Identified intangibles, with finite useful lives, accumulated amortization | (312.3) | (236.1) | (295.3) | (214.8)
Amortization expense | (34.6) | (37.1) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (17.7) | (12.9) |  |
Net book value as of end of period | 687.0 | 658.7 | 679.8 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 3.1 | 5.9 |  |
Impact of exchange rate movements | (0.1) | (2.9) |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
Total | 634.9 |  |  |
Identifiable intangibles with indefinite useful lives | 52.1 |  |  |
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 | 40.0 | 16.9 |  |
Adjustment for fully amortized intangibles | 6.7 | 12.7 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 605.4 | 484.6 | 572.1 | 480.4
Identified intangibles, with finite useful lives, accumulated amortization | (162.7) | (113.9) | (147.8) | (104.0)
Amortization expense | (21.6) | (22.6) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (6.7) | (12.7) |  |
Net book value as of end of period | 442.7 | 370.7 |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
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 | 7.9 | 0.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.1 | 0.5 |  |
Intangible Assets, Gross (Excluding Goodwill) | 258.0 | 285.2 | 265.8 | 285.7
Identified intangibles, with finite useful lives, accumulated amortization | (96.7) | (79.7) | (94.1) | (68.3)
Amortization expense | (10.5) | (11.6) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (7.9) | 0.0 |  |
Net book value as of end of period | 161.3 | 205.5 |  |
Impact of exchange rate movements | 0.0 | 0.2 |  |
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 | 0.9 | 0.2 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.2 | 3.4 |  |
Intangible Assets, Gross (Excluding Goodwill) | 58.8 | 52.3 | 55.7 | 55.9
Identified intangibles, with finite useful lives, accumulated amortization | (40.5) | (32.6) | (39.5) | (33.1)
Amortization expense | (1.8) | (1.8) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (0.9) | (0.2) |  |
Net book value as of end of period | 18.3 | 19.7 |  |
Impact of exchange rate movements | (0.1) | (2.1) |  |
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 | 2.2 | 0.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (0.4) | 2.1 |  |
Intangible Assets, Gross (Excluding Goodwill) | 21.0 | 19.8 | 23.6 | 21.4
Identified intangibles, with finite useful lives, accumulated amortization | (6.6) | (6.6) | (8.6) | (6.7)
Amortization expense | (0.3) | (0.4) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (2.2) | 0.0 |  |
Net book value as of end of period | 14.4 | 13.2 |  |
Impact of exchange rate movements | 0.1 | (0.5) |  |
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 | (1.8) | 1.1 |  |
Intangible Assets, Gross (Excluding Goodwill) | 56.1 | 52.9 | 57.9 | 54.0
Identified intangibles, with finite useful lives, accumulated amortization | (5.8) | (3.3) | $ (5.3) | $ (2.7)
Amortization expense | (0.4) | (0.7) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 | 0.0 |  |
Net book value as of end of period | 50.3 | 49.6 |  |
Impact of exchange rate movements | $ (0.1) | $ (0.1) |  |

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