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Segment Information - Revenue, Properties and Outsourcing Assets by Geographic Segment (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 664.5 $ 666.8
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 333.8 330.9
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 78.9 82.0
Other foreign    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 251.8 $ 253.9