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Segment Information - Revenue, Properties and Outsourcing Assets by Geographic Segment (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues $ 667.4 $ 666.2 $ 1,375.8 $ 1,330.7
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 305.3 308.5 591.8 642.3
United Kingdom        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 80.9 66.6 195.7 145.5
Other foreign        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues $ 281.2 $ 291.1 $ 588.3 $ 542.9