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Business Combinations - Intangible Assets Acquired (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Acquired Finite-Lived Intangible Assets      
Weighted-average Estimated Useful Life   13 years  
Customer relationships      
Acquired Finite-Lived Intangible Assets      
Weighted-average Estimated Useful Life   13 years  
Unpatented technology      
Acquired Finite-Lived Intangible Assets      
Weighted-average Estimated Useful Life   13 years  
AXC      
Acquired Finite-Lived Intangible Assets      
Weighted-average Estimated Useful Life 11 years    
Finite lived intangible assets acquired $ 201.4    
Total identifiable intangible assets acquired 256.4   $ 256.4
AXC | Trademarks and trade names      
Acquired Indefinite-lived Intangible Assets      
Indefinite lived assets, trademarks and trade names $ 55.0 $ 39.0 $ 55.0
AXC | Customer relationships      
Acquired Finite-Lived Intangible Assets      
Weighted-average Estimated Useful Life 14 years    
Finite lived intangible assets acquired $ 139.1    
AXC | Unpatented technology      
Acquired Finite-Lived Intangible Assets      
Weighted-average Estimated Useful Life 10 years    
Finite lived intangible assets acquired $ 42.1    
AXC | Backlog      
Acquired Finite-Lived Intangible Assets      
Weighted-average Estimated Useful Life 1 year    
Finite lived intangible assets acquired $ 19.2    
AXC | Other identifiable intangible assets      
Acquired Finite-Lived Intangible Assets      
Weighted-average Estimated Useful Life 4 years    
Finite lived intangible assets acquired $ 1.0