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Segment and Geographic Information Segment and Geographic Information - Revenues and Assets by Geographic Location (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information
Revenue	$ 550.3	$ 544.7	$ 554.1	$ 545.4	$ 589.8	$ 613.1	$ 646.6	$ 635.0	$ 2,194.6	$ 2,484.5	$ 2,510.9
Fixed Assets, net	110.1				114.1				110.1	114.1	95.4
United States
Segment Reporting Information
Revenue									1,477.5	1,657.2	1,731.5
Fixed Assets, net	97.3				98.6				97.3	98.6	80.2
United Kingdom
Segment Reporting Information
Revenue									566.4	645.3	567.1
Fixed Assets, net	9.9				12.3				9.9	12.3	11.9
Other
Segment Reporting Information
Revenue									150.7	182.0	212.3
Fixed Assets, net	$ 2.9				$ 3.2				$ 2.9	$ 3.2	$ 3.3

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- Definition

Amount of fixed fee revenue for the management of an investment fund portfolio. Excludes investment advisory, distribution and servicing, and performance fees.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(14))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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