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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | $ 666.2 | $ 748.9 | $ 1,330.7 | $ 1,415.7
United States |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 308.5 | 348.4 | 642.3 | 679.3
United Kingdom |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | 66.6 | 109.3 | 145.5 | 191.3
Other foreign |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenues | $ 291.1 | $ 291.2 | $ 542.9 | $ 545.1

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