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Marketable Securities - Schedule of Marketable Securities (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Current assets
   
Schedule Of Available For Sale Securities [Line Items]    
Market value $ 1.6 $ 0.9
Cost basis 1.6 0.9
Unrealized gains, net     
Noncurrent assets
   
Schedule Of Available For Sale Securities [Line Items]    
Market value 253.6 256.8
Cost basis 253.6 256.7
Unrealized gains, net    0.1
Noncurrent assets | Other
   
Schedule Of Available For Sale Securities [Line Items]    
Market value 3.6 6.8
Cost basis 3.6 6.7
Unrealized gains, net    0.1
Amalgamated Sugar Company LLC | Noncurrent assets
   
Schedule Of Available For Sale Securities [Line Items]    
Market value 250.0 250.0
Cost basis 250.0 250.0
Unrealized gains, net