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Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2013
Deferred tax assets:      
Depreciation and amortization $ 10.9 $ 11.1  
Accrued expenses 27.6 28.5  
Net operating loss, capital loss, alternative minimum tax, research and development, and foreign tax credit carryforwards 29.1 44.6  
Definite lived intangibles 1.4 1.6  
Pension benefits 33.5 35.3  
Deferred revenue 0.0 0.1  
Gross deferred tax assets 102.5 121.2  
Valuation allowance (5.9) (3.8) $ (10.4)
Total deferred tax assets 96.6 117.4  
Deferred tax liabilities:      
Depreciation and amortization (6.6) (5.0)  
Expenses capitalized for book (2.0) (1.4)  
Pension benefits (14.7) (13.4)  
Intangibles liabilities (52.6) (52.1)  
Deferred Tax Liabilities, Other (0.1) (0.1)  
Gross deferred tax liabilities (76.0) (72.0)  
Net deferred tax assets $ 20.6 $ 45.4