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Summary of Significant Accounting Policies (Details) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) yr | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 01, 2017 USD ($)
Cumulative Effect from Adoption of new accounting for stock-based compensation |  | $ 0.0 |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  | 3.5 | $ 3.6 | $ (2.8) |
ASU 2016-09, New Accounting Pronouncement or Change in Accounting Principle, Description | no material impact |  |  |  |
Noncontrolling Interest [Abstract] |  |  |  |  |
Redeemable Noncontrolling Interest, Beginning Balance | $ 6.8 | 6.8 | 11.1 | 13.4 |
Redeemable Noncontrolling Interest, Acquisition Date Fair Value |  | (3.5) | (3.6) | 2.8 |
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest |  | (0.1) | 0.1 | 1.6 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest |  | 0.6 | (0.8) | (1.1) |
Redeemable Noncontrolling Interest, Ending Balance |  | 3.8 | 6.8 | 11.1 |
Gross and Net Accounting [Abstract] |  |  |  |  |
Gross revenue and expenses for management services |  | 1,220.6 | 1,023.5 | 801.3 |
Bank Servicing Fees |  | 43.3 | 37.0 | 7.9 |
Mortgage servicing rights |  | 186.7 | 160.8 |  |
Fair Value, Estimate Not Practicable, Mortgage-backed Securities Held-to-maturity |  | 220.1 | 180.0 |  |
Restricted Cash and Cash Equivalents |  | $ 70.0 | 72.2 |  |
Investments in Real Estate Ventures [Abstract] |  |  |  |  |
Minimum ownership percentage in real estate ventures (in hundredths) |  | 1.00% |  |  |
Maximum ownership percentage in real estate ventures (in hundredths) |  | 10.00% |  |  |
Derivatives and Hedging Activities [Abstract] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), Unrealized |  | $ (11.3) | (14.2) | 11.7 |
Foreign Currency Translation [Abstract] |  |  |  |  |
Net foreign currency gains (losses) |  | (4.8) | (6.2) | (2.0) |
Additional Paid-in Capital [Member] |  |  |  |  |
Cumulative Effect from Adoption of new accounting for stock-based compensation |  | (1.3) |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  | 1.1 | 0.8 | 0.2 |
Noncontrolling Interest [Abstract] |  |  |  |  |
Redeemable Noncontrolling Interest, Acquisition Date Fair Value |  | (1.1) | $ (0.8) | $ (0.2) |
Retained Earnings [Member] |  |  |  |  |
Cumulative Effect from Adoption of new accounting for stock-based compensation |  | $ 1.3 |  |  | $ 1.3
Stock Compensation Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Sum Of Age Plus Years Of Service Minimum | yr |  | 65 |  |  |

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