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Acquisitions (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
contract
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
contract
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
contract
Mar. 31, 2020
USD ($)
Acquisitions              
Number of acquisitions | contract           9  
Number of 2019 acquisitions whose acquisition accounting has not yet been completed | contract   1   1      
Acquisition-related expenses   $ 0.0 $ 0.0 $ 0.0 $ 25.4    
Acquisition-related expenses, net of tax         21.0    
Purchase price, net of cash acquired       50.3 891.2 $ 937.4  
Contingent consideration             $ 75.0
Amortization expense   $ 12.3 $ 13.6 $ 37.6 54.0    
SSI Controls Technologies              
Acquisitions              
Purchase price, net of cash acquired $ 400.0            
Backlog              
Acquisitions              
Amortization of acquired backlog         15.7    
Backlog | SSI Controls Technologies              
Acquisitions              
Amortization of acquired backlog         $ 12.5    
Interconnect Products and Assemblies              
Acquisitions              
Number of acquisitions | contract       2   8