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Earnings per Share - Reconciliation of Numerator and Denominator of Basic and Diluted Earnings per Share Calculation and Anti-dilutive Share-based Awards (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share Basic And Diluted [Line Items]    
Basic $ 0.29 $ 0.41
Diluted $ 0.28 $ 0.41
Net earnings $ 9.3 $ 13.4
Weighted average number of common shares outstanding 32.6 32.4
Dilutive awards 0.2 0.0
Diluted weighted average number of common shares outstanding 32.8 32.4
Total weighted average number of anti-dilutive share-based awards 0.2 0.0
Restricted stock units    
Earnings Per Share Basic And Diluted [Line Items]    
Total weighted average number of anti-dilutive share-based awards 0.1 0.0
Stock options    
Earnings Per Share Basic And Diluted [Line Items]    
Total weighted average number of anti-dilutive share-based awards 0.1 0.0