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Summary of Effect of Share-Based Compensation Awards on Weighted Average Number of Shares Outstanding Used in Calculating Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net (loss) income $ 5.4 $ 28.8 $ (48.8) $ 22.8
Weighted average common shares outstanding 56.3 57.3 56.4 57.1
Assumed exercise/vesting of equity awards 0.4 0.4 0.0 0.6
Weighted average diluted common shares outstanding 56.7 57.7 56.4 57.7
Net earnings (loss) per basic share (in usd oer share) $ 0.10 $ 0.50 $ (0.87) $ 0.40
Net earnings (loss) per diluted share (in usd oer share) $ 0.10 $ 0.50 $ (0.87) $ 0.40