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Intangible Assets and Goodwill (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jan. 28, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]            
Amortization of purchased intangible assets $ 74.6 $ 81.2 $ 149.3 $ 161.7    
2020 (remainder) 56.5   56.5      
2021 113.0   113.0      
2022 113.0   113.0      
2023 113.0   113.0      
2024 113.0   113.0      
2025 113.0   113.0      
Goodwill [Line Items]            
Goodwill $ 5,075.2   $ 5,075.2     $ 5,037.4
KANUMA            
Goodwill [Line Items]            
Weighted average cost of capital 10.00%   10.00%      
Net $ 820.0   $ 820.0      
In-process research & development assets (IPR&D)            
Goodwill [Line Items]            
Impairment $ 11.0          
Achillion            
Goodwill [Line Items]            
Goodwill         $ 37.8