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Fair Value Measurements (Details 2) (Assets and liabilities measured on a nonrecurring basis, USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Level 3
    
Major categories of assets and liabilities measured on a recurring basis, at fair value    
Property, plant and equipment, net $ 86.1 $ 42.3
Goodwill 55.8 52.0
Intangible assets, net 25.9 16.9
Total 167.8 111.2
Fair Value
    
Major categories of assets and liabilities measured on a recurring basis, at fair value    
Property, plant and equipment, net 86.1 42.3
Goodwill 55.8 52.0
Intangible assets, net 25.9 16.9
Total $ 167.8 $ 111.2