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Goodwill and Other Intangible Assets, Amortization (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Intangible assets    
Amortization expense $ 12.9 $ 24.8
Amortization expense estimated for each of the next five fiscal years    
Remainder of 2020 36.5  
2021 44.5  
2022 37.3  
2023 34.5  
2024 29.0  
2024 $ 20.2  
Backlog    
Intangible assets    
Amortization of acquired backlog   $ 12.5