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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite And Indefinite Lived Intangible Assets Gross |  |  | $ 506.7 | $ 470.9
Finite and Indefinite lived Intangible Assets, Additions | $ 413.1 | $ 42.5 |  |
Adjustment for fully amortized intangibles | 46.6 | 55.8 |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | 0.5 |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (5.2) | (5.0) |  |
Intangible Assets, Gross (Excluding Goodwill) | 867.5 | 452.6 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (191.9) | (161.1) | (169.8) | (165.9)
Amortization expense | (71.6) | (53.8) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (46.6) | (55.8) |  |
Accelerated Depreciation on Intangibles | (0.5) |  |  |
Impact of exchange rate movements | (2.4) | 2.8 |  |
Net book value as of end of period | 675.6 | 291.5 | 336.9 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 10.6 | 8.7 |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2019 (3 months) | 34.2 |  |  |
2020 | 114.1 |  |  |
2021 | 102.4 |  |  |
2022 | 88.5 |  |  |
2023 | 78.7 |  |  |
2024 | 69.1 |  |  |
Thereafter | 138.6 |  |  |
Total | 625.6 |  |  |
Mortgage servicing rights [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2019 (3 months) | 17.6 |  |  |
2020 | 62.9 |  |  |
2021 | 58.2 |  |  |
2022 | 49.9 |  |  |
2023 | 42.6 |  |  |
2024 | 34.9 |  |  |
Thereafter | 94.4 |  |  |
Total | 360.5 |  |  |
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 |  |  | 266.2 | 241.8
Finite and Indefinite lived Intangible Assets, Additions | 208.3 | 36.8 |  |
Adjustment for fully amortized intangibles | 21.8 | 17.2 |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | 0.0 |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 452.7 | 261.4 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (92.2) | (70.1) | (72.4) | (55.1)
Amortization expense | (41.6) | (32.2) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (21.8) | (17.2) |  |
Accelerated Depreciation on Intangibles | 0.0 |  |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 360.5 | 191.3 |  |
Other Intangible Assets [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2019 (3 months) | 16.6 |  |  |
2020 | 51.2 |  |  |
2021 | 44.2 |  |  |
2022 | 38.6 |  |  |
2023 | 36.1 |  |  |
2024 | 34.2 |  |  |
Thereafter | 44.2 |  |  |
Total | 265.1 |  |  |
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 Gross |  |  | 90.0 | 117.0
Finite and Indefinite lived Intangible Assets, Additions | 194.5 | 3.6 |  |
Adjustment for fully amortized intangibles | 0.7 | 36.2 |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | 0.5 |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.3 |  |
Intangible Assets, Gross (Excluding Goodwill) | 283.3 | 84.7 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (56.5) | (35.3) | (38.8) | (61.3)
Amortization expense | (18.9) | (10.2) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (0.7) | (36.2) |  |
Accelerated Depreciation on Intangibles | (0.5) |  |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 226.8 | 49.4 |  |
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 Gross |  |  | 83.1 | 88.8
Finite and Indefinite lived Intangible Assets, Additions | 0.0 | 0.0 |  |
Adjustment for fully amortized intangibles | 22.1 | 1.7 |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | 0.0 |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (2.8) | (3.3) |  |
Intangible Assets, Gross (Excluding Goodwill) | 58.2 | 83.8 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (35.0) | (49.1) | (51.8) | (43.1)
Amortization expense | (7.5) | (9.5) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (22.1) | (1.7) |  |
Accelerated Depreciation on Intangibles | 0.0 |  |  |
Impact of exchange rate movements | (2.2) | 1.8 |  |
Net book value as of end of period | 23.2 | 34.7 |  |
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 Gross |  |  | 23.5 | 23.3
Finite and Indefinite lived Intangible Assets, Additions | 0.0 | 2.1 |  |
Adjustment for fully amortized intangibles | 2.0 | 0.7 |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | 0.0 |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (0.8) | (2.0) |  |
Intangible Assets, Gross (Excluding Goodwill) | 20.7 | 22.7 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (6.2) | (6.6) | (6.8) | (6.4)
Amortization expense | (1.6) | (1.9) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (2.0) | (0.7) |  |
Accelerated Depreciation on Intangibles | 0.0 |  |  |
Impact of exchange rate movements | (0.2) | 1.0 |  |
Net book value as of end of period | 14.5 | 16.1 |  |
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 Gross |  |  | 43.9 | 0.0
Finite and Indefinite lived Intangible Assets, Additions | 10.3 | 0.0 |  |
Adjustment for fully amortized intangibles | 0.0 | 0.0 |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | 0.0 |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (1.6) | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 52.6 | 0.0 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (2.0) | 0.0 | $ 0.0 | $ 0.0
Amortization expense | (2.0) | 0.0 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 | 0.0 |  |
Accelerated Depreciation on Intangibles | 0.0 |  |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | $ 50.6 | $ 0.0 |  |

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