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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Document Period End Date | Sep. 30, 2020 |  |  |
Finite and Indefinite lived Intangible Assets, Additions | $ 78.4 | $ 413.1 |  |
Adjustment for fully amortized intangibles | 45.4 | 46.6 |  |
Impairment of Intangible Assets (Excluding Goodwill) |  | (0.5) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.5 | 5.2 |  |
Intangible Assets, Gross (Excluding Goodwill) | 930.9 | 867.5 | $ 897.4 | $ 506.7
Identified intangibles, with finite useful lives, accumulated amortization | (277.0) | (191.9) | (214.8) | (169.8)
Amortization expense | (108.8) | (71.6) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (45.4) | (46.6) |  |
Accelerated Depreciation on Intangibles |  | 0.5 |  |
Net book value as of end of period | 653.9 | 675.6 | 682.6 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 15.3 | 10.6 |  |
Impact of exchange rate movements | 1.2 | (2.4) |  |
Valuation Allowance for Impairment of Recognized Servicing Assets, Deductions for Aggregate Write-Downs | 1.9 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2020 (3 months) | 33.2 |  |  |
2021 | 114.8 |  |  |
2022 | 102.2 |  |  |
2023 | 93.5 |  |  |
2024 | 81.6 |  |  |
2025 | 56.6 |  |  |
Thereafter | 120.0 |  |  |
Total | 601.9 |  |  |
Mortgage servicing rights [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2020 (3 months) | 17.2 |  |  |
2021 | 66.2 |  |  |
2022 | 59.3 |  |  |
2023 | 53.0 |  |  |
2024 | 45.4 |  |  |
2025 | 37.7 |  |  |
Thereafter | 110.0 |  |  |
Total | 388.8 |  |  |
Mortgage servicing rights [Member] | Reportable Subsegments [Member] | Americas [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite And Indefinite Lived Intangible Assets Gross |  |  | 480.4 |
Finite and Indefinite lived Intangible Assets, Additions | 77.9 | 208.3 |  |
Adjustment for fully amortized intangibles | 30.9 | 21.8 |  |
Impairment of Intangible Assets (Excluding Goodwill) |  | 0.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 527.4 | 452.7 |  | 266.2
Identified intangibles, with finite useful lives, accumulated amortization | (138.6) | (92.2) | (104.0) | (72.4)
Amortization expense | (65.5) | (41.6) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (30.9) | (21.8) |  |
Accelerated Depreciation on Intangibles |  | 0.0 |  |
Net book value as of end of period | 388.8 | 360.5 |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Other Intangible Assets [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2020 (3 months) | 16.0 |  |  |
2021 | 48.6 |  |  |
2022 | 42.9 |  |  |
2023 | 40.5 |  |  |
2024 | 36.2 |  |  |
2025 | 18.9 |  |  |
Thereafter | 10.0 |  |  |
Total | 213.1 |  |  |
Other Intangible Assets [Member] | Reportable Subsegments [Member] | Americas [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 0.0 | 194.5 |  |
Adjustment for fully amortized intangibles | 14.1 | 0.7 |  |
Impairment of Intangible Assets (Excluding Goodwill) |  | (0.5) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (0.2) | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 271.4 | 283.3 | 285.7 | 90.0
Identified intangibles, with finite useful lives, accumulated amortization | (88.8) | (56.5) | (68.3) | (38.8)
Amortization expense | (35.0) | (18.9) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (14.1) | (0.7) |  |
Accelerated Depreciation on Intangibles |  | 0.5 |  |
Net book value as of end of period | 182.6 | 226.8 |  |
Impact of exchange rate movements | 0.4 | 0.0 |  |
Other Intangible Assets [Member] | Reportable Subsegments [Member] | EMEA [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 | 0.4 | 22.1 |  |
Impairment of Intangible Assets (Excluding Goodwill) |  | 0.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (1.5) | 2.8 |  |
Intangible Assets, Gross (Excluding Goodwill) | 54.0 | 58.2 | 55.9 | 83.1
Identified intangibles, with finite useful lives, accumulated amortization | (37.0) | (35.0) | (33.1) | (51.8)
Amortization expense | (5.2) | (7.5) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (0.4) | (22.1) |  |
Accelerated Depreciation on Intangibles |  | 0.0 |  |
Net book value as of end of period | 17.0 | 23.2 |  |
Impact of exchange rate movements | 0.9 | (2.2) |  |
Other Intangible Assets [Member] | Reportable Subsegments [Member] | Asia Pacific [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 0.5 | 0.0 |  |
Adjustment for fully amortized intangibles | 0.0 | 2.0 |  |
Impairment of Intangible Assets (Excluding Goodwill) |  | 0.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.3 | 0.8 |  |
Intangible Assets, Gross (Excluding Goodwill) | 22.2 | 20.7 | 21.4 | 23.5
Identified intangibles, with finite useful lives, accumulated amortization | (7.9) | (6.2) | (6.7) | (6.8)
Amortization expense | (1.1) | (1.6) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 | (2.0) |  |
Accelerated Depreciation on Intangibles |  | 0.0 |  |
Net book value as of end of period | 14.3 | 14.5 |  |
Impact of exchange rate movements | (0.1) | (0.2) |  |
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 | 10.3 |  |
Adjustment for fully amortized intangibles | 0.0 | 0.0 |  |
Impairment of Intangible Assets (Excluding Goodwill) |  | 0.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 1.9 | 1.6 |  |
Intangible Assets, Gross (Excluding Goodwill) | 55.9 | 52.6 | 54.0 | 43.9
Identified intangibles, with finite useful lives, accumulated amortization | (4.7) | (2.0) | $ (2.7) | $ 0.0
Amortization expense | (2.0) | (2.0) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 | 0.0 |  |
Accelerated Depreciation on Intangibles |  | 0.0 |  |
Net book value as of end of period | 51.2 | 50.6 |  |
Impact of exchange rate movements | $ 0.0 | $ 0.0 |  |

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