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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Document Period End Date | Jun. 30, 2020 |  |  |
Finite and Indefinite lived Intangible Assets, Additions | $ 43.5 | $ 31.9 |  |
Adjustment for fully amortized intangibles | 26.7 | 22.2 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (4.4) | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 909.8 | 516.4 | $ 897.4 | $ 506.7
Identified intangibles, with finite useful lives, accumulated amortization | (256.9) | (180.3) | (214.8) | (169.8)
Amortization expense | (71.4) | (33.6) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (26.7) | (22.2) |  |
Net book value as of end of period | 652.9 | 336.1 | 682.6 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 9.3 | 3.0 |  |
Impact of exchange rate movements | 2.6 | (0.9) |  |
Valuation Allowance for Impairment of Recognized Servicing Assets, Deductions for Aggregate Write-Downs | 2.8 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2020 (6 months) | 62.2 |  |  |
2021 | 112.5 |  |  |
2022 | 99.5 |  |  |
2023 | 90.6 |  |  |
2024 | 78.5 |  |  |
2025 | 53.6 |  |  |
Thereafter | 106.0 |  |  |
Total | 602.9 |  |  |
Mortgage servicing rights [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2020 (6 months) | 33.3 |  |  |
2021 | 63.9 |  |  |
2022 | 56.6 |  |  |
2023 | 50.1 |  |  |
2024 | 42.3 |  |  |
2025 | 34.7 |  |  |
Thereafter | 96.0 |  |  |
Total | 376.9 |  |  |
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 | 43.0 | 21.2 |  |
Adjustment for fully amortized intangibles | 20.0 | 8.2 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 503.4 | 279.2 |  | 266.2
Identified intangibles, with finite useful lives, accumulated amortization | (126.5) | (82.8) | (104.0) | (72.4)
Amortization expense | (42.5) | (18.6) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (20.0) | (8.2) |  |
Net book value as of end of period | 376.9 | 196.4 |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Other Intangible Assets [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2020 (6 months) | 28.9 |  |  |
2021 | 48.6 |  |  |
2022 | 42.9 |  |  |
2023 | 40.5 |  |  |
2024 | 36.2 |  |  |
2025 | 18.9 |  |  |
Thereafter | 10.0 |  |  |
Total | 226.0 |  |  |
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 | 0.9 |  |
Adjustment for fully amortized intangibles | 6.2 | 0.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (0.4) | (0.1) |  |
Intangible Assets, Gross (Excluding Goodwill) | 279.1 | 91.0 | 285.7 | 90.0
Identified intangibles, with finite useful lives, accumulated amortization | (85.2) | (45.7) | (68.3) | (38.8)
Amortization expense | (23.4) | (7.1) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (6.2) | 0.0 |  |
Net book value as of end of period | 193.9 | 45.3 |  |
Impact of exchange rate movements | 0.3 | 0.2 |  |
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 | 0.1 |  |
Adjustment for fully amortized intangibles | 0.5 | 14.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (3.5) | 0.8 |  |
Intangible Assets, Gross (Excluding Goodwill) | 51.9 | 68.4 | 55.9 | 83.1
Identified intangibles, with finite useful lives, accumulated amortization | (33.9) | (42.5) | (33.1) | (51.8)
Amortization expense | (3.5) | (5.4) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (0.5) | (14.0) |  |
Net book value as of end of period | 18.0 | 25.9 |  |
Impact of exchange rate movements | 2.2 | (0.7) |  |
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 | 0.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (0.4) | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 21.5 | 23.5 | 21.4 | 23.5
Identified intangibles, with finite useful lives, accumulated amortization | (7.3) | (7.9) | (6.7) | (6.8)
Amortization expense | (0.7) | (1.1) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 | 0.0 |  |
Net book value as of end of period | 14.2 | 15.6 |  |
Impact of exchange rate movements | 0.1 | 0.0 |  |
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 | 9.7 |  |
Adjustment for fully amortized intangibles | 0.0 | 0.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (0.1) | (0.7) |  |
Intangible Assets, Gross (Excluding Goodwill) | 53.9 | 54.3 | 54.0 | 43.9
Identified intangibles, with finite useful lives, accumulated amortization | (4.0) | (1.4) | $ (2.7) | $ 0.0
Amortization expense | (1.3) | (1.4) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 | 0.0 |  |
Net book value as of end of period | 49.9 | 52.9 |  |
Impact of exchange rate movements | $ 0.0 | $ 0.0 |  |

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