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Property, Plant, and Equipment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Property, Plant, and Equipment [Line Items]          
Property, plant, and equipment, at cost $ 5,631.1   $ 5,631.1   $ 5,515.4
Less accumulated depreciation (2,778.4)   (2,778.4)   (2,657.8)
Property, plant, and equipment, net 2,852.7   2,852.7   2,857.6
Depreciation [Abstract]          
Depreciation expense 78.7 $ 93.0 163.9 $ 169.0  
Incremental depreciation expense     9.0 $ 17.2  
Purchases of property, plant, and equipment included in accounts payable     31.4   13.9
Land and Land Improvements          
Property, Plant, and Equipment [Line Items]          
Property, plant, and equipment, at cost 150.7   150.7   143.5
Buildings          
Property, Plant, and Equipment [Line Items]          
Property, plant, and equipment, at cost 659.5   659.5   654.6
Machinery and Equipment          
Property, Plant, and Equipment [Line Items]          
Property, plant, and equipment, at cost 4,621.3   4,621.3   4,508.0
Construction in Progress          
Property, Plant, and Equipment [Line Items]          
Property, plant, and equipment, at cost 144.7   144.7   154.8
Other          
Property, Plant, and Equipment [Line Items]          
Property, plant, and equipment, at cost $ 54.9   $ 54.9   $ 54.5