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Shareholders' Equity - Schedule of Treasury Shares (Detail)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Shareholders Equity[abstract]  
Beginning balance $ 51.8
Used for stock options plan (20.4)
Ending balance $ 31.4
Quantity, Beginning balance | shares 7,423,705
Quantity, Used for stock options plan | shares (2,446,007)
Quantity, Ending balance | shares 4,977,698
Share value, Beginning balance | $ / shares $ 7.0
Share value, Used for stock options plan | $ / shares 8.3
Share value, Ending balance | $ / shares $ 6.3
Net income of uses, Used for stock options plan $ 10.9
Net income of uses, Ending balance $ 10.9