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Goodwill and Other Intangible Assets, Amortization (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Intangible assets            
Impairment of intangible assets     $ 0.0   $ 0.0 $ 0.0
Amortization expense $ 12.3 $ 11.6 36.4 $ 42.8    
Amortization expense estimated for each of the next five fiscal years            
Remainder of 2017 12.3   12.3      
2018 45.2   45.2      
2019 41.3   41.3      
2020 35.9   35.9      
2021 30.4   30.4      
2022 $ 23.1   $ 23.1      
Backlog            
Intangible assets            
Amortization expense       $ 8.0