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Property, Plant and Equipment Property, Plant and Equipment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Accumulated depreciation $ 1,841.0   $ 1,797.4
Depreciation 52.9 $ 65.0  
Solothurn, Switzerland      
Property, Plant and Equipment [Line Items]      
Construction in progress 1,700.0   $ 1,600.0
Contractual commitments for the construction of the facility 92.0    
Building      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment held for sale 312.8    
Machinery and Equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment held for sale $ 286.5