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Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Dec. 30, 2017
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Income Tax Disclosure [Abstract]          
Income tax expense (benefit) $ 2.1   $ (1.6) $ 3.0 $ 0.1
Pretax income (loss) from continuing operations $ 14.3   $ (6.1) $ 19.8 $ (14.6)
Effective income tax rates 14.70%   26.20% 15.20% (0.70%)
Remeasurement of deferred tax liabilities net   $ 32.2      
Benefit due to reclassification of alternative minimum tax credit carryforward   $ 1.3