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Property, Plant and Equipment (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Property, plant and equipment:    
Property, plant and equipment $ 2,711.1 $ 2,663.2
Accumulated depreciation (1,442.4) (1,414.9)
Property, plant and equipment, net $ 1,268.7 $ 1,248.3