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Investments in Unconsolidated Affiliates (Hamer and Bri-Mar) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Subsidiary, Sale of Stock [Line Items]          
Equity in earnings of unconsolidated affiliates, net of tax $ 8.6 $ 7.7 $ 24.9 $ 24.4  
Investments in unconsolidated affiliates 331.7   331.7   387.9
Hamer, LLC
         
Subsidiary, Sale of Stock [Line Items]          
Equity in earnings of unconsolidated affiliates, net of tax 0.1   0.5    
Proceeds from Equity Method Investment, Dividends or Distributions 0.8        
Investments in unconsolidated affiliates 3.7   3.7   4.0
Bri-Mar Manufacturing, LLC
         
Subsidiary, Sale of Stock [Line Items]          
Equity in earnings of unconsolidated affiliates, net of tax 0.4   0.9    
Investments in unconsolidated affiliates $ 2.8   $ 2.8   $ 1.9