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Other Consolidated Financial Statement Detail (Details Textual) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Other Liabilities, Noncurrent $ 1,389.4   $ 1,348.9 $ 1,389.4
Increase to goodwill     117.5 1,080.1
Accrued construction in progress 125.2   78.0 125.2
Accrued Income Taxes, Noncurrent 791.4   803.3 791.4
Solothurn        
Business Acquisition [Line Items]        
Accrued construction in progress 100.0   $ 50.0 100.0
TECFIDERA | Fumapharm AG        
Business Acquisition [Line Items]        
Increase to goodwill 300.0     1,200.0
TECFIDERA | Fumapharm AG | Twenty billion        
Business Acquisition [Line Items]        
Increase to goodwill 300.0      
Cumulative sales level 20,000.0     20,000.0
TECFIDERA | Fumapharm AG | Each additional one billion up to twenty billion        
Business Acquisition [Line Items]        
Cumulative sales level $ 20,000.0     $ 20,000.0
TECFIDERA | Fumapharm AG | Fifteen billion        
Business Acquisition [Line Items]        
Cumulative sales level   $ 15,000.0    
TECFIDERA | Fumapharm AG | Sixteen billion        
Business Acquisition [Line Items]        
Increase to goodwill   600.0    
Cumulative sales level   $ 16,000.0