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Other Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Other Liabilities Disclosure [Abstract]    
Retirement benefits $ 12.3 $ 10.9
Unrecognized tax benefits 5.9 4.8
Interest rate caps 2.5 6.1
Contingent consideration 0.5 1.5
Other 8.7 7.4
Other liabilities $ 29.9 $ 30.7