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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite And Indefinite Lived Intangible Assets Gross | $ 437.7 | $ 383.2 | $ 475.6 | $ 366.2
Finite and Indefinite lived Intangible Assets, Additions | 29.5 | 17.2 |  |
Adjustment for fully amortized intangibles | (69.2) |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 1.8 | (0.2) |  |
Identified intangibles, with finite useful lives, accumulated amortization | (129.5) | (148.8) | (180.6) | (139.0)
Amortization expense | 17.4 | 10.5 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 69.2 |  |  |
Impact of exchange rate movements | (0.7) | 0.7 |  |
Net book value as of end of period | 308.2 | 234.4 | 295.0 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 2.6 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2017 (9 months) | 44.6 |  |  |
2018 | 52.4 |  |  |
2019 | 46.6 |  |  |
2020 | 40.5 |  |  |
2021 | 30.7 |  |  |
2022 | 27.9 |  |  |
Thereafter | 56.7 |  |  |
Total | 299.4 |  |  |
Reportable Subsegments [Member] | Americas [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Adjustment for fully amortized intangibles | (50.0) |  |  |
Mortgage servicing rights [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2017 (9 months) | 22.1 |  |  |
2018 | 27.8 |  |  |
2019 | 24.3 |  |  |
2020 | 20.8 |  |  |
2021 | 17.3 |  |  |
2022 | 14.4 |  |  |
Thereafter | 44.3 |  |  |
Total | 171.0 |  |  |
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 | 209.7 | 169.8 | 193.1 | 171.6
Finite and Indefinite lived Intangible Assets, Additions | 20.0 | (1.8) |  |
Adjustment for fully amortized intangibles | (3.4) |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (38.7) | (14.6) | (32.3) | (8.6)
Amortization expense | 9.8 | 6.0 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 3.4 |  |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 171.0 | 155.2 |  |
Other Intangible Assets [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2017 (9 months) | 22.5 |  |  |
2018 | 24.6 |  |  |
2019 | 22.3 |  |  |
2020 | 19.7 |  |  |
2021 | 13.4 |  |  |
2022 | 13.5 |  |  |
Thereafter | 12.4 |  |  |
Total | 128.4 |  |  |
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 | 117.3 | 139.6 | 167.1 | 125.5
Finite and Indefinite lived Intangible Assets, Additions | 0.2 | 14.3 |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | (0.2) |  |
Identified intangibles, with finite useful lives, accumulated amortization | (52.1) | (90.4) | (98.7) | (88.4)
Amortization expense | 3.5 | 2.1 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 50.0 |  |  |
Impact of exchange rate movements | 0.1 | 0.1 |  |
Net book value as of end of period | 65.2 | 49.2 |  |
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 Gross | 87.0 | 52.2 | 91.1 | 48.5
Finite and Indefinite lived Intangible Assets, Additions | 2.4 | 4.5 |  |
Adjustment for fully amortized intangibles | (7.7) |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 1.2 | (0.8) |  |
Identified intangibles, with finite useful lives, accumulated amortization | (34.5) | (33.8) | (38.0) | (32.6)
Amortization expense | 3.5 | 2.0 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 7.7 |  |  |
Impact of exchange rate movements | (0.7) | 0.8 |  |
Net book value as of end of period | 52.5 | 18.4 |  |
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 | 23.7 | 14.9 | 24.2 | 14.3
Finite and Indefinite lived Intangible Assets, Additions | 6.9 | 0.2 |  |
Adjustment for fully amortized intangibles | (8.0) |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.6 | 0.4 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (4.2) | (9.9) | (11.5) | (9.3)
Amortization expense | 0.6 | 0.4 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 8.0 |  |  |
Impact of exchange rate movements | (0.1) | (0.2) |  |
Net book value as of end of period | 19.5 | 5.0 |  |
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 | 6.7 | 0.1 | 6.3
Finite and Indefinite lived Intangible Assets, Additions | 0.0 | 0.0 |  |
Adjustment for fully amortized intangibles | (0.1) |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.4 |  |
Identified intangibles, with finite useful lives, accumulated amortization | 0.0 | (0.1) | $ (0.1) | $ (0.1)
Amortization expense | 0.0 | 0.0 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.1 |  |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | $ 0.0 | $ 6.6 |  |

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