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Property, Plant and Equipment Property, Plant and Equipment (Details)
SFr in Millions, $ in Millions
3 Months Ended
Dec. 31, 2015
CHF (SFr)
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Property, Plant and Equipment [Line Items]      
Accumulated depreciation   $ 1,330.1 $ 1,528.4
Solothurn, Switzerland      
Property, Plant and Equipment [Line Items]      
Construction in progress   99.0 $ 350.8
Solothurn, Switzerland | Land      
Property, Plant and Equipment [Line Items]      
Land purchase SFr 64.4 $ 62.5