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Goodwill and Other Intangible Assets, Amortization (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Intangible assets    
Amortization expense $ 12.0 $ 19.7
Amortization expense estimated for each of the next five fiscal years    
Remainder of 2017 36.0  
2018 43.9  
2019 39.8  
2020 34.1  
2021 29.4  
2022 $ 22.8  
Backlog    
Intangible assets    
Amortization expense   $ 8.0