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Acquisitions (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
agreement
contract
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
contract
Acquisitions      
Number of acquisitions | agreement 4    
Purchase price, net of cash acquired $ 185.6 $ 16.5  
Amortization expense $ 12.3 $ 12.9  
Cable Products and Solutions      
Acquisitions      
Number of acquisitions | agreement 1    
Interconnect Products and Assemblies      
Acquisitions      
Number of acquisitions 3   2
Purchase price, net of cash acquired     $ 50.4
Number of acquisitions for which acquisition accounting has been completed | contract 1