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Goodwill and Other Intangible Assets, Amortization (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Intangible assets        
Amortization expense $ 12.5 $ 15.6 $ 25.4 $ 40.4
Amortization expense estimated for each of the next five fiscal years        
Remainder of 2020 23.9   23.9  
2021 44.7   44.7  
2022 37.4   37.4  
2023 34.6   34.6  
2024 29.0   29.0  
2025 $ 20.2   $ 20.2  
Backlog        
Intangible assets        
Amortization of acquired backlog   $ 3.2   15.7
SSI Controls Technologies | Backlog        
Intangible assets        
Amortization of acquired backlog       $ 12.5