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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 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 | $ 31.9 | $ 26.0 |  |
Adjustment for fully amortized intangibles | 22.2 | 14.3 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | (3.5) |  |
Intangible Assets, Gross (Excluding Goodwill) | 516.4 | 479.1 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (180.3) | (186.3) | (169.8) | (165.9)
Amortization expense | (33.6) | (36.8) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (22.2) | (14.3) |  |
Impact of exchange rate movements | (0.9) | 2.1 |  |
Net book value as of end of period | 336.1 | 292.8 | 336.9 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 3.0 | 6.5 |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2019 (6 months) | 34.3 |  |  |
2020 | 53.1 |  |  |
2021 | 43.4 |  |  |
2022 | 33.6 |  |  |
2023 | 27.8 |  |  |
2024 | 23.4 |  |  |
Thereafter | 70.5 |  |  |
Total | 286.1 |  |  |
Mortgage servicing rights [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2019 (6 months) | 15.7 |  |  |
2020 | 30.5 |  |  |
2021 | 27.9 |  |  |
2022 | 25.2 |  |  |
2023 | 21.9 |  |  |
2024 | 19.4 |  |  |
Thereafter | 55.8 |  |  |
Total | 196.4 |  |  |
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 | 21.2 | 24.0 |  |
Adjustment for fully amortized intangibles | 8.2 | 11.9 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 279.2 | 253.9 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (82.8) | (65.4) | (72.4) | (55.1)
Amortization expense | (18.6) | (22.2) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (8.2) | (11.9) |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 196.4 | 188.5 |  |
Other Intangible Assets [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2019 (6 months) | 18.6 |  |  |
2020 | 22.6 |  |  |
2021 | 15.5 |  |  |
2022 | 8.4 |  |  |
2023 | 5.9 |  |  |
2024 | 4.0 |  |  |
Thereafter | 14.7 |  |  |
Total | 89.7 |  |  |
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 | 0.9 | 0.6 |  |
Adjustment for fully amortized intangibles | 0.0 | 0.4 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.1 | (0.1) |  |
Intangible Assets, Gross (Excluding Goodwill) | 91.0 | 117.1 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (45.7) | (67.5) | (38.8) | (61.3)
Amortization expense | (7.1) | (6.9) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 | (0.4) |  |
Impact of exchange rate movements | (0.2) | (0.3) |  |
Net book value as of end of period | 45.3 | 49.6 |  |
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 | 0.1 | 0.0 |  |
Adjustment for fully amortized intangibles | 14.0 | 1.3 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (0.8) | (1.9) |  |
Intangible Assets, Gross (Excluding Goodwill) | 68.4 | 85.6 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (42.5) | (47.3) | (51.8) | (43.1)
Amortization expense | (5.4) | (6.4) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | (14.0) | (1.3) |  |
Impact of exchange rate movements | (0.7) | 0.9 |  |
Net book value as of end of period | 25.9 | 38.3 |  |
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 | 1.4 |  |
Adjustment for fully amortized intangibles | 0.0 | 0.7 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | (1.5) |  |
Intangible Assets, Gross (Excluding Goodwill) | 23.5 | 22.5 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (7.9) | (6.1) | (6.8) | (6.4)
Amortization expense | (1.1) | (1.3) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 | (0.7) |  |
Impact of exchange rate movements | 0.0 | 0.9 |  |
Net book value as of end of period | 15.6 | 16.4 |  |
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 | 9.7 | 0.0 |  |
Adjustment for fully amortized intangibles | 0.0 | 0.0 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.7 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 54.3 | 0.0 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (1.4) | 0.0 | $ 0.0 | $ 0.0
Amortization expense | (1.4) | 0.0 |  |
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 | $ 52.9 | $ 0.0 |  |

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