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Goodwill and Other Intangible Assets, Amortization (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Intangible assets        
Amortization expense $ 13.6 $ 11.6 $ 54.0 $ 35.4
Amortization expense estimated for each of the next five fiscal years        
Remainder of 2019 13.1   13.1  
2020 48.4   48.4  
2021 43.8   43.8  
2022 36.6   36.6  
2023 33.9   33.9  
2024 $ 28.8   28.8  
Backlog        
Intangible assets        
Amortization of acquired backlog     15.7  
SSI Controls Technologies | Backlog        
Intangible assets        
Amortization of acquired backlog     $ 12.5