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SCHEDULE II - Valuation and Qualifying Accounts (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for Doubtful Accounts
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning balance $ 2.4 $ 2.4 $ 1.9
Additions 0.6 0.4 1.1
Deductions (0.6) (0.4) (0.6)
Ending balance 2.4 2.4 2.4
Inventory Valuation Reserve
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning balance 7.7 7.4 7.1
Additions 3.9 2.3 2.2
Deductions (2.8) (2.0) (1.9)
Ending balance 8.8 7.7 7.4
Valuation Allowance of Deferred Tax Assets
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning balance 123.9 112.8 25.2
Additions 17.3 11.2 89.4
Deductions (9.4) (0.1) (1.8)
Ending balance $ 131.8 $ 123.9 $ 112.8