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Acquisitions (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
contract
Dec. 31, 2017
USD ($)
Acquisitions              
Number of acquisitions | item         9    
Acquisition-related expenses   $ 8.9 $ 16.5 $ 8.5 $ 25.4 $ 8.5 $ 4.0
Acquisition-related expenses, net of tax   $ 7.8 $ 13.2 7.2 21.0 7.2 3.7
Purchase price, net of cash acquired         937.4 158.9 265.5
Goodwill       4,103.2 4,867.1 4,103.2 4,042.6
Goodwill deductible for tax purposes         455.0    
Amortization expense         67.3 46.9 48.6
SSI Controls Technologies              
Acquisitions              
Aggregate purchase price, net of cash acquired (subject to post-closing adjustments) $ 400.0            
2019 Acquisitions [Member]              
Acquisitions              
Goodwill         784.6    
Definite-lived intangible assets         $ 111.8    
2019 Acquisitions [Member] | Minimum              
Acquisitions              
Useful lives         5 years    
2019 Acquisitions [Member] | Maximum              
Acquisitions              
Useful lives         10 years    
Backlog              
Acquisitions              
Amortization expense         $ 15.7    
Cable Products and Solutions              
Acquisitions              
Number of acquisitions | item         1    
Goodwill       146.5 $ 157.1 $ 146.5 146.5
Interconnect Products and Assemblies              
Acquisitions              
Number of acquisitions | contract           3  
Purchase price, net of cash acquired           $ 158.9  
Goodwill       $ 3,956.7 $ 4,710.0 $ 3,956.7 $ 3,896.1