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Summary of Significant Accounting Policies, Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property and Equipment [Abstract]
Depreciation expense	$ 117.7	$ 97.2	$ 84.2
Mortgage servicing rights	160.8	163.0
Property, Plant and Equipment [Line Items]
Foreign Currency Transaction Gain (Loss), Unrealized	14.2	11.7	$ (7.7)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	3.6	2.8
Property and equipment, gross value	989.0	872.5
Total accumulated depreciation	(488.0)	(449.2)
Net property and equipment	501.0	423.3
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 100.8	82.8
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	2 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	13 years
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 589.9	510.6
Computer equipment and software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	1 year
Computer equipment and software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	10 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 239.2	209.3
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	20 years
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 59.1	69.8
Automobiles [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	4 years
Automobiles [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	30 years
Additional Paid-in Capital [Member]
Property, Plant and Equipment [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	$ 0.8	$ 0.2

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- Definition

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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