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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite And Indefinite Lived Intangible Assets Gross |  |  | $ 470.9 | $ 475.6
Finite and Indefinite lived Intangible Assets, Additions | $ 26.0 | $ 38.1 |  |
Adjustment for fully amortized intangibles | (14.3) | (71.8) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (3.5) | 5.7 |  |
Intangible Assets, Gross (Excluding Goodwill) | 479.1 | 447.6 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (186.3) | (145.6) | (165.9) | (180.6)
Amortization expense | (36.8) | (34.6) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 14.3 | 71.8 |  |
Impact of exchange rate movements | 2.1 | (2.2) |  |
Net book value as of end of period | 292.8 | 302.0 | 305.0 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 6.5 | 4.3 |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2018 (6 months) | 29.6 |  |  |
2019 | 53.0 |  |  |
2020 | 46.3 |  |  |
2021 | 36.2 |  |  |
2022 | 27.5 |  |  |
2023 | 22.0 |  |  |
Thereafter | 69.4 |  |  |
Total | 284.0 |  |  |
Reportable Subsegments [Member] | Americas [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles |  | 50.0 |  |
Reportable Subsegments [Member] | EMEA [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles |  | 7.7 |  |
Reportable Subsegments [Member] | Asia Pacific [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles |  | 8.0 |  |
Investment Management [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles |  | 0.1 |  |
Mortgage servicing rights [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2018 (6 months) | 15.8 |  |  |
2019 | 29.3 |  |  |
2020 | 27.1 |  |  |
2021 | 23.8 |  |  |
2022 | 21.0 |  |  |
2023 | 17.7 |  |  |
Thereafter | 53.8 |  |  |
Total | 188.5 |  |  |
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 |  |  | 241.8 | 193.1
Finite and Indefinite lived Intangible Assets, Additions | 24.0 | 29.0 |  |
Adjustment for fully amortized intangibles | (11.9) | (6.0) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 253.9 | 216.1 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (65.4) | (45.2) | (55.1) | (32.3)
Amortization expense | (22.2) | (18.9) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 11.9 | 6.0 |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 188.5 | 170.9 |  |
Other Intangible Assets [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2018 (6 months) | 13.8 |  |  |
2019 | 23.7 |  |  |
2020 | 19.2 |  |  |
2021 | 12.4 |  |  |
2022 | 6.5 |  |  |
2023 | 4.3 |  |  |
Thereafter | 15.6 |  |  |
Total | 95.5 |  |  |
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 |  |  | 117.0 | 167.1
Finite and Indefinite lived Intangible Assets, Additions | 0.6 | 0.2 |  |
Adjustment for fully amortized intangibles | (0.4) | (50.0) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (0.1) | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 117.1 | 117.3 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (67.5) | (55.4) | (61.3) | (98.7)
Amortization expense | (6.9) | (6.9) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.4 |  |  |
Impact of exchange rate movements | 0.3 | 0.2 |  |
Net book value as of end of period | 49.6 | 61.9 |  |
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 |  |  | 88.8 | 91.1
Finite and Indefinite lived Intangible Assets, Additions | 0.0 | 3.1 |  |
Adjustment for fully amortized intangibles | (1.3) | (7.7) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (1.9) | 4.8 |  |
Intangible Assets, Gross (Excluding Goodwill) | 85.6 | 91.3 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (47.3) | (40.1) | (43.1) | (38.0)
Amortization expense | (6.4) | (7.6) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 1.3 |  |  |
Impact of exchange rate movements | 0.9 | (2.2) |  |
Net book value as of end of period | 38.3 | 51.2 |  |
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 Gross |  |  | 23.3 | 24.2
Finite and Indefinite lived Intangible Assets, Additions | 1.4 | 5.8 |  |
Adjustment for fully amortized intangibles | (0.7) | (8.0) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | (1.5) | 0.9 |  |
Intangible Assets, Gross (Excluding Goodwill) | 22.5 | 22.9 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (6.1) | (4.9) | (6.4) | (11.5)
Amortization expense | (1.3) | (1.2) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.7 |  |  |
Impact of exchange rate movements | 0.9 | (0.2) |  |
Net book value as of end of period | 16.4 | 18.0 |  |
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 Gross |  |  | 0.0 | 0.1
Finite and Indefinite lived Intangible Assets, Additions | 0.0 | 0.0 |  |
Adjustment for fully amortized intangibles | 0.0 | (0.1) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 0.0 | 0.0 |  |
Identified intangibles, with finite useful lives, accumulated amortization | 0.0 | 0.0 | $ 0.0 | $ (0.1)
Amortization expense | 0.0 | 0.0 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.0 |  |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | $ 0.0 | $ 0.0 |  |

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