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Segment Information - Revenue, Properties and Outsourcing Assets by Geographic Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 666.3	$ 683.3	$ 1,997.0	$ 2,099.0
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	313.2	327.1	955.5	1,006.4
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	65.8	72.3	211.3	263.6
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 287.3	$ 283.9	$ 830.2	$ 829.0

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

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