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Other Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other Liabilities, Noncurrent [Abstract]    
Income tax payable $ 25.6 $ 0.0
Unrecognized tax benefits 12.3 4.8
Retirement benefits 12.2 10.9
Purchase consideration payable 12.2 0.0
Interest rate caps 0.0 6.1
Contingent consideration 0.0 1.5
Other 8.5 7.4
Total other liabilities $ 70.8 $ 30.7