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Quarterly Financial Summary - Schedule of Quarterly Financial Summary (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Schedule Of Quarterly Financial Summary [Line Items]                
Insurance recovery     $ 19.0       $ 7.0  
Goodwill and asset impairment charges   85.6   188.8   2.7   96.5
Legal costs related to regulatory matters         11.4      
Asset Impairment Charges 41.4              
Gain on sale of business       27.1        
Severance expense $ 13.1