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Quarterly Financial Data - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Valuation Allowance of Deferred Tax Assets and Other Items
Jun. 29, 2013
Valuation Allowance of Deferred Tax Assets and Other Items
Dec. 31, 2012
Valuation Allowance of Deferred Tax Assets and Other Items
Quarterly Financial Information [Line Items]              
Provision (benefit) for income taxes   $ 192.7 $ (638.0) $ 68.8 $ 16.0 $ (21.5) $ (766.9)
Insurance recoveries, net of losses and incremental costs $ 30.1