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Property, Plant and Equipment Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Accumulated depreciation $ 1,730.6 $ 1,559.1
Solothurn, Switzerland    
Property, Plant and Equipment [Line Items]    
Construction in progress 1,600.0 $ 1,200.0
Contractual commitments for the construction of the facility $ 200.0