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Investments in Unconsolidated Affiliates (Hamer) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Subsidiary, Sale of Stock [Line Items]        
Equity in earnings of unconsolidated affiliates, net of tax $ 12.5 $ 7.1 $ 26.3 $ 16.3