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Business Combinations, Goodwill and Other Intangible Assets, Other Intangibles by Segment (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |
Additions, net of adjustments (1) | $ 139.5 | $ 454.0 |
Adjustment for fully amortized intangibles | (69.2) | (64.1) |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | (0.5) |
Impact of exchange rate movements | 7.4 | 1.3 |
Intangible Assets, Gross (Excluding Goodwill) | 975.1 | 897.4 | $ 506.7
Identified intangibles, with finite useful lives, accumulated amortization | (295.3) | (214.8) | (169.8)
Amortization expense, net (2) | (148.2) | (109.8) |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 69.2 | 64.1 |
Accelerated Depreciation on Intangibles |  | 0.5 |
Impact of exchange rate movements | (1.5) | (0.2) |
Net book value as of end of period | 679.8 | 682.6 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 23.7 | 16.6 |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |
2021 | 120.6 |  |
2022 | 108.7 |  |
2023 | 100.4 |  |
2024 | 88.4 |  |
2025 | 63.2 |  |
Thereafter | 144.5 |  |
Total | 625.8 |  |
Valuation Allowance for Impairment of Recognized Servicing Assets, Deductions for Aggregate Write-Downs | $ 0.1 |  |
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] |  |  |
2021 | $ 71.7 |  |
2022 | 65.6 |  |
2023 | 59.8 |  |
2024 | 52.1 |  |
2025 | 44.1 |  |
Thereafter | 131.0 |  |
Total | 424.3 |  |
Mortgage servicing rights [Member] | Americas [Member] |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |
Additions, net of adjustments (1) | 139.0 | 247.6 |
Adjustment for fully amortized intangibles | (47.3) | (33.4) |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | 0.0 |
Impact of exchange rate movements | 0.0 | 0.0 |
Intangible Assets, Gross (Excluding Goodwill) | 572.1 | 480.4 | 266.2
Identified intangibles, with finite useful lives, accumulated amortization | (147.8) | (104.0) | (72.4)
Amortization expense, net (2) | (91.1) | (65.0) |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 47.3 | 33.4 |
Accelerated Depreciation on Intangibles |  | 0.0 |
Impact of exchange rate movements | 0.0 | 0.0 |
Net book value as of end of period | $ 424.3 |  |
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 2 months 12 days |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |
2021 | $ 48.9 |  |
2022 | 43.1 |  |
2023 | 40.6 |  |
2024 | 36.3 |  |
2025 | 19.1 |  |
Thereafter | 13.5 |  |
Total | 201.5 |  |
Other Intangible Assets [Member] | LaSalle [Member] |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |
Additions, net of adjustments (1) | 0.0 | 9.6 |
Adjustment for fully amortized intangibles | 0.0 | 0.0 |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | 0.0 |
Impact of exchange rate movements | 3.9 | 0.5 |
Intangible Assets, Gross (Excluding Goodwill) | 57.9 | 54.0 | 43.9
Identified intangibles, with finite useful lives, accumulated amortization | (5.3) | (2.7) | 0.0
Amortization expense, net (2) | (2.6) | (2.7) |
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 | 52.6 |  |
Other Intangible Assets [Member] | Americas [Member] |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |
Additions, net of adjustments (1) | 0.0 | 196.7 |
Adjustment for fully amortized intangibles | (19.9) | (0.6) |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | (0.5) |
Impact of exchange rate movements | 0.0 | 0.1 |
Intangible Assets, Gross (Excluding Goodwill) | 265.8 | 285.7 | 90.0
Identified intangibles, with finite useful lives, accumulated amortization | (94.1) | (68.3) | (38.8)
Amortization expense, net (2) | (46.0) | (30.7) |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 19.9 | 0.6 |
Accelerated Depreciation on Intangibles |  | 0.5 |
Impact of exchange rate movements | (0.3) | (0.1) |
Net book value as of end of period | 171.7 |  |
Other Intangible Assets [Member] | EMEA [Member] |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |
Additions, net of adjustments (1) | 0.0 | 0.1 |
Adjustment for fully amortized intangibles | (1.9) | (28.1) |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | 0.0 |
Impact of exchange rate movements | 1.7 | 0.8 |
Intangible Assets, Gross (Excluding Goodwill) | 55.7 | 55.9 | 83.1
Identified intangibles, with finite useful lives, accumulated amortization | (39.5) | (33.1) | (51.8)
Amortization expense, net (2) | (7.1) | (9.5) |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 1.9 | 28.1 |
Accelerated Depreciation on Intangibles |  | 0.0 |
Impact of exchange rate movements | (1.2) | (0.1) |
Net book value as of end of period | 16.2 |  |
Other Intangible Assets [Member] | Asia Pacific [Member] |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |
Additions, net of adjustments (1) | 0.5 | 0.0 |
Adjustment for fully amortized intangibles | (0.1) | (2.0) |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | 0.0 |
Impact of exchange rate movements | 1.8 | 0.1 |
Intangible Assets, Gross (Excluding Goodwill) | 23.6 | 21.4 | 23.5
Identified intangibles, with finite useful lives, accumulated amortization | (8.6) | (6.7) | $ (6.8)
Amortization expense, net (2) | (1.4) | (1.9) |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 0.1 | 2.0 |
Accelerated Depreciation on Intangibles |  | 0.0 |
Impact of exchange rate movements | (0.6) | $ 0.0 |
Net book value as of end of period | $ 15.0 |  |

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