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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 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 | $ 447.6 | $ 390.3 | $ 475.6 | $ 366.2
Finite and Indefinite lived Intangible Assets, Additions | 38.1 | 27.1 |  |
Adjustment for fully amortized intangibles | (71.8) |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 5.7 | (3.0) |  |
Identified intangibles, with finite useful lives, accumulated amortization | (145.6) | (156.6) | (180.6) | (139.0)
Amortization expense | 34.6 | 20.3 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 71.8 |  |  |
Impact of exchange rate movements | (2.2) | 2.7 |  |
Net book value as of end of period | 302.0 | 233.7 | 295.0 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 4.3 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2017 (6 months) | 32.3 |  |  |
2018 | 52.6 |  |  |
2019 | 47.3 |  |  |
2020 | 41.3 |  |  |
2021 | 31.5 |  |  |
2022 | 28.7 |  |  |
Thereafter | 59.5 |  |  |
Total | 293.2 |  |  |
Mortgage servicing rights [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2017 (6 months) | 14.9 |  |  |
2018 | 28.4 |  |  |
2019 | 25.1 |  |  |
2020 | 21.8 |  |  |
2021 | 18.2 |  |  |
2022 | 15.2 |  |  |
Thereafter | 47.3 |  |  |
Total | 170.9 |  |  |
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 | 216.1 | 177.9 | 193.1 | 171.6
Finite and Indefinite lived Intangible Assets, Additions | 29.0 | 6.3 |  |
Adjustment for fully amortized intangibles | (6.0) |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (45.2) | (20.0) | (32.3) | (8.6)
Amortization expense | 18.9 | 11.4 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 6.0 |  |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 170.9 | 157.9 |  |
Other Intangible Assets [Member] |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2017 (6 months) | 17.4 |  |  |
2018 | 24.2 |  |  |
2019 | 22.2 |  |  |
2020 | 19.5 |  |  |
2021 | 13.3 |  |  |
2022 | 13.5 |  |  |
Thereafter | 12.2 |  |  |
Total | 122.3 |  |  |
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 | 138.3 | 167.1 | 125.5
Finite and Indefinite lived Intangible Assets, Additions | 0.2 | 13.0 |  |
Adjustment for fully amortized intangibles | (50.0) |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | (0.2) |  |
Identified intangibles, with finite useful lives, accumulated amortization | (55.4) | (92.3) | (98.7) | (88.4)
Amortization expense | 6.9 | 4.2 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 50.0 |  |  |
Impact of exchange rate movements | 0.2 | 0.3 |  |
Net book value as of end of period | 61.9 | 46.0 |  |
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 | 91.3 | 51.8 | 91.1 | 48.5
Finite and Indefinite lived Intangible Assets, Additions | 3.1 | 6.6 |  |
Adjustment for fully amortized intangibles | (7.7) |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 4.8 | (3.3) |  |
Identified intangibles, with finite useful lives, accumulated amortization | (40.1) | (34.0) | (38.0) | (32.6)
Amortization expense | 7.6 | 4.0 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 7.7 |  |  |
Impact of exchange rate movements | (2.2) | 2.6 |  |
Net book value as of end of period | 51.2 | 17.8 |  |
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 | 22.9 | 15.8 | 24.2 | 14.3
Finite and Indefinite lived Intangible Assets, Additions | 5.8 | 1.2 |  |
Adjustment for fully amortized intangibles | (8.0) |  |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.9 | 0.3 |  |
Identified intangibles, with finite useful lives, accumulated amortization | (4.9) | (10.2) | (11.5) | (9.3)
Amortization expense | 1.2 | 0.7 |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 8.0 |  |  |
Impact of exchange rate movements | (0.2) | (0.2) |  |
Net book value as of end of period | 18.0 | 5.6 |  |
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 | 6.5 | 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 | 0.2 |  |
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 | $ 6.4 |  |

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