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Income Taxes (Deferred Income Tax) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Jan. 01, 2017
Long-term:    
Accrued liabilities $ 16.9 $ 36.4
Inventory valuation 14.3 17.7
Accrued vacation 7.6 10.7
Deferred compensation and other benefit plans 11.6 24.5
Postretirement benefits other than pensions 3.0 4.6
Tax credit and net operating loss carryforward 49.8 47.7
Valuation allowance (8.8) (16.9)
Total deferred income tax assets 94.4 124.7
Long-term:    
Property, plant and equipment differences 28.6 30.6
Intangible amortization 113.4 110.7
Other 3.4 4.8
Total deferred income tax liabilities 145.4 146.1
Net deferred income tax liabilities $ 51.0 $ 21.4