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Other Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Other liabilities    
Interest rate caps $ 35.5 $ 0.0
Retirement benefits 11.7 11.2
Unrecognized tax benefits 0.3 0.3
Other 6.9 16.3
Total other liabilities $ 54.4 $ 27.8