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Discontinued Operations - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Net (loss) income attributable to noncontrolling interest $ 0.1 $ (0.5) $ 0.1  
Additional paid in capital   2,284.6   $ 1,565.4
Proceeds from divesture of business     $ 0.9  
Other accrued expenses   20.1   15.0
LifeWorks [Member]        
Additional paid in capital   95.7    
Other accrued expenses   $ 0.2   $ 0.3