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Goodwill and Other Intangible Assets, Amortization (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Intangible assets        
Amortization expense $ 15.6 $ 11.9 $ 40.4 $ 23.8
Amortization expense estimated for each of the next five fiscal years        
Remainder of 2019 25.6   25.6  
2020 46.8   46.8  
2021 42.1   42.1  
2022 34.8   34.8  
2023 32.0   32.0  
2024 28.5   28.5  
Backlog        
Intangible assets        
Amortization of acquired backlog $ 3.2   15.7  
SSI Controls Technologies | Backlog        
Intangible assets        
Amortization of acquired backlog     $ 12.5