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Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Deferred Tax Assets, Property, Plant and Equipment $ 11.2 $ 10.9
Deferred tax assets:    
Accrued expenses 25.9 27.6
Net operating loss, capital loss, alternative minimum tax, research and development, and foreign tax credit carryforwards 22.6 29.1
Definite lived intangibles 1.2 1.4
Pension benefits 32.9 33.5
Deferred Tax Assets, Other 0.1 0.0
Gross deferred tax assets 93.9 102.5
Valuation allowance (7.7) (5.9)
Total deferred tax assets 86.2 96.6
Deferred tax liabilities:    
Depreciation and amortization (10.5) (6.6)
Expenses capitalized for book (1.4) (2.0)
Pension benefits (14.5) (14.7)
Intangibles liabilities (51.1) (52.6)
Deferred Tax Liabilities, Other (0.2) (0.1)
Gross deferred tax liabilities (77.7) (76.0)
Net deferred tax assets $ 8.5 $ 20.6