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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
New Accounting Standard, Hypothetical Retrospective Adjustment |  | $ 41.3 |
Unamortized Debt Issuance Expense |  | 18.1 |
Bank Servicing Fees | $ 37.0 | 7.9 | $ 2.5
Restricted Cash and Cash Equivalents | 72.2 | 75.6 |
Redeemable Noncontrolling Interest | 6.8 | 11.1 | 13.4
Redeemable Noncontrolling Interest, Acquisition Date Fair Value | (3.6) | (2.8) |
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | 0.1 | 1.6 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest | 0.8 | (1.1) |
Effect of Exchange Rate on Cash and Cash Equivalents | 7.0 | 16.6 | 10.3
Unrecognized Tax Benefits | 37.6 | 28.3 | 48.5
Depreciation | 117.7 | 97.2 | 84.2
Unbilled Contracts Receivable | 402.9 | 374.6 |
Gross and Net Accounting [Abstract] |  |  |
Gross revenue and expenses for management services | 1,023.5 | 801.3 | 727.9
Mortgage servicing rights | $ 160.8 | 163.0 |
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% |  |
Unrealized gain on investments for which fair value option is elected | $ 16.6 | 21.1 | 7.1
Derivatives and Hedging Activities [Abstract] |  |  |
Foreign currency forward contracts, net notional value | 1,390.0 | 1,260.0 |
Foreign Currency Transaction Gain (Loss), Unrealized | (14.2) | (11.7) | 7.7
Derivative, Notional Amount | 1,900.0 | 2,280.0 |
Foreign Currency Translation [Abstract] |  |  |
Accumulated other comprehensive loss | (551.1) | (336.3) |
Net foreign currency gains (losses) | 6.2 | (2.0) | $ (8.5)
Fair Value, Estimate Not Practicable, Mortgage-backed Securities Held-to-maturity | 180.0 | 167.2 |
Line of Credit [Member] |  |  |
Unamortized Debt Issuance Expense | 19.6 | 15.4 |
Long-Term Senior Notes [Member] |  |  |
Unamortized Debt Issuance Expense | 2.3 | 2.7 |
Additional Paid-in Capital [Member] |  |  |
Redeemable Noncontrolling Interest, Acquisition Date Fair Value | (0.8) | (0.2) |
Redeemable Noncontrolling Interest, Equity, Redemption Value | $ 0.8 | $ 0.2 |

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