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Intangible Assets and Goodwill - Changes in Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Goodwill, beginning of year $ 5,757.8 $ 5,706.4
Increase to goodwill 0.0 117.5
Elimination of goodwill allocated to Hillerød, Denmark manufacturing operations 0.0 (69.5)
Other 4.3 3.4
Goodwill, end of year $ 5,762.1 $ 5,757.8