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Goodwill and Other Intangible Assets, Amortization (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Intangible assets    
Amortization expense $ 24.8 $ 11.9
Amortization expense estimated for each of the next five fiscal years    
Remainder of 2019 35.1  
2020 41.8  
2021 37.1  
2022 29.7  
2023 27.0  
2024 23.9  
SSI Controls Technologies | Backlog    
Intangible assets    
Amortization of acquisition-related costs $ 12.5