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Discontinued Operations - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Discontinued Operations And Disposal Groups [Abstract]        
Income (loss) from discontinued operations, net of taxes $ (0.1) $ 4.5 $ (0.1) $ 4.4