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Goodwill and Other Intangible Assets, Amortization (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Intangible assets        
Amortization expense $ 12.0 $ 11.4 $ 24.0 $ 31.1
Amortization expense estimated for each of the next five fiscal years        
Remainder of 2017 24.6   24.6  
2018 45.2   45.2  
2019 41.2   41.2  
2020 35.6   35.6  
2021 30.9   30.9  
2022 $ 23.3   $ 23.3  
Backlog        
Intangible assets        
Amortization expense       $ 8.0