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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]
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