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Business Combinations, Goodwill and Other Intangible Assets, Other Intangibles by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Additions, net of adjustments (1) |  | $ 454.0 | $ 107.0 |
Adjustment for fully amortized intangibles |  | (64.1) | (64.4) |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | (0.5) |  |
Impact of exchange rate movements |  | (1.3) | 6.8 |
Intangible Assets, Gross (Excluding Goodwill) | $ 897.4 | 897.4 | 506.7 | $ 470.9
Identified intangibles, with finite useful lives, accumulated amortization | (214.8) | (214.8) | (169.8) | (165.9)
Amortization expense, net (2) |  | (109.8) | (72.2) |
Accumulated Amortization Adjustment for fully Amortized Intangibles |  | 64.1 | 64.4 |
Accelerated Depreciation on Intangibles |  | 0.5 |  |
Impact of exchange rate movements |  | 0.2 | (3.9) |
Net book value as of end of period | 682.6 | 682.6 | 336.9 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments |  | 16.6 | 11.4 |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2020 | 122.0 | 122.0 |  |
2021 | 109.8 | 109.8 |  |
2022 | 96.1 | 96.1 |  |
2023 | 86.6 | 86.6 |  |
2024 | 74.7 | 74.7 |  |
Thereafter | 143.4 | 143.4 |  |
Total | $ 632.6 | 632.6 |  |
Mortgage servicing rights [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 4 years 4 months 24 days |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2020 | $ 65.4 | 65.4 |  |
2021 | 61.2 | 61.2 |  |
2022 | 53.2 | 53.2 |  |
2023 | 46.1 | 46.1 |  |
2024 | 38.5 | 38.5 |  |
Thereafter | 112.0 | 112.0 |  |
Total | 376.4 | 376.4 |  |
Mortgage servicing rights [Member] | Reportable Subsegments [Member] | Americas [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Additions, net of adjustments (1) |  | 247.6 | 49.9 |
Adjustment for fully amortized intangibles |  | (33.4) | (25.5) |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | 0.0 |  |
Impact of exchange rate movements |  | 0.0 | 0.0 |
Intangible Assets, Gross (Excluding Goodwill) | 480.4 | 480.4 | 266.2 | 241.8
Identified intangibles, with finite useful lives, accumulated amortization | (104.0) | (104.0) | (72.4) | (55.1)
Amortization expense, net (2) |  | (65.0) | (42.8) |
Accumulated Amortization Adjustment for fully Amortized Intangibles |  | 33.4 | 25.5 |
Accelerated Depreciation on Intangibles |  | 0.0 |  |
Impact of exchange rate movements |  | 0.0 | 0.0 |
Net book value as of end of period | $ 376.4 | 376.4 |  |
Other Intangible Assets [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years 6 months |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
2020 | $ 56.6 | 56.6 |  |
2021 | 48.6 | 48.6 |  |
2022 | 42.9 | 42.9 |  |
2023 | 40.5 | 40.5 |  |
2024 | 36.2 | 36.2 |  |
Thereafter | 31.4 | 31.4 |  |
Total | 256.2 | 256.2 |  |
Other Intangible Assets [Member] | Reportable Subsegments [Member] | Americas [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Additions, net of adjustments (1) |  | 196.7 | 9.1 |
Adjustment for fully amortized intangibles |  | (0.6) | (36.2) |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | (0.5) |  |
Impact of exchange rate movements |  | (0.1) | (0.1) |
Intangible Assets, Gross (Excluding Goodwill) | 285.7 | 285.7 | 90.0 | 117.0
Identified intangibles, with finite useful lives, accumulated amortization | (68.3) | (68.3) | (38.8) | (61.3)
Amortization expense, net (2) |  | (30.7) | (14.0) |
Accumulated Amortization Adjustment for fully Amortized Intangibles |  | 0.6 | 36.2 |
Accelerated Depreciation on Intangibles |  | 0.5 |  |
Impact of exchange rate movements |  | 0.1 | 0.3 |
Net book value as of end of period | 217.4 | 217.4 |  |
Other Intangible Assets [Member] | Reportable Subsegments [Member] | EMEA [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Additions, net of adjustments (1) |  | 0.1 | 0.3 |
Adjustment for fully amortized intangibles |  | (28.1) | (1.7) |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | 0.0 |  |
Impact of exchange rate movements |  | (0.8) | 4.3 |
Intangible Assets, Gross (Excluding Goodwill) | 55.9 | 55.9 | 83.1 | 88.8
Identified intangibles, with finite useful lives, accumulated amortization | (33.1) | (33.1) | (51.8) | (43.1)
Amortization expense, net (2) |  | (9.5) | (12.8) |
Accumulated Amortization Adjustment for fully Amortized Intangibles |  | 28.1 | 1.7 |
Accelerated Depreciation on Intangibles |  | 0.0 |  |
Impact of exchange rate movements |  | 0.1 | (2.4) |
Net book value as of end of period | 22.8 | 22.8 |  |
Other Intangible Assets [Member] | Reportable Subsegments [Member] | Asia Pacific [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Additions, net of adjustments (1) |  | 0.0 | 3.8 |
Adjustment for fully amortized intangibles |  | (2.0) | (1.0) |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | 0.0 |  |
Impact of exchange rate movements |  | 0.1 | 2.6 |
Intangible Assets, Gross (Excluding Goodwill) | 21.4 | 21.4 | 23.5 | 23.3
Identified intangibles, with finite useful lives, accumulated amortization | (6.7) | (6.7) | (6.8) | (6.4)
Amortization expense, net (2) |  | (1.9) | (2.6) |
Accumulated Amortization Adjustment for fully Amortized Intangibles |  | 2.0 | 1.0 |
Accelerated Depreciation on Intangibles |  | 0.0 |  |
Impact of exchange rate movements |  | 0.0 | (1.2) |
Net book value as of end of period | 14.7 | 14.7 |  |
Other Intangible Assets [Member] | LaSalle [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Additions, net of adjustments (1) |  | 9.6 | 43.9 |
Adjustment for fully amortized intangibles |  | 0.0 | 0.0 |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | 0.0 |  |
Impact of exchange rate movements |  | (0.5) | 0.0 |
Intangible Assets, Gross (Excluding Goodwill) | 54.0 | 54.0 | 43.9 | 0.0
Identified intangibles, with finite useful lives, accumulated amortization | (2.7) | (2.7) | 0.0 | $ 0.0
Amortization expense, net (2) |  | (2.7) | 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 | $ 51.3 | $ 51.3 |  |

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