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Classification of Net Deferred Tax Assets in Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]    
Current net deferred tax assets $ 12.5 $ 4.0
Current valuation allowance (0.1) (14.6)
Total current net deferred tax assets (liabilities) 12.4 (10.6)
Long-term net deferred tax asset 42.8 81.4
Long-term valuation allowance (9.7) (117.2)
Long-term net deferred tax liability $ 33.1 $ (35.8)