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Deferred Income Tax Assets and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred tax assets:      
Depreciation and amortization $ 12.5 $ 12.5  
Accrued expenses 27.9 28.0  
Net operating loss, capital loss, alternative minimum tax, research and development, and foreign tax credit carryforwards 75.0 73.1  
Pension benefits 31.1 27.4  
Other 0.3 0.2  
Deferred revenue 0.1 0.1  
Gross deferred tax assets 148.7 143.1  
Valuation allowance (131.8) (123.9) (76.0)
Total deferred tax assets 16.9 19.2  
Deferred tax liabilities:      
Depreciation and amortization (5.0) (5.9)  
Expenses capitalized for book (2.1) (2.5)  
Gross deferred tax liabilities (63.3) (62.9)  
Net deferred tax liability (46.4) (43.7)  
Definite lived intangibles
      
Deferred tax assets:      
Intangibles assets 1.8 1.8  
Indefinite lived intangibles
      
Deferred tax liabilities:      
Intangibles liabilities $ (56.2) $ (54.5)