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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Definite-Lived Intangible Assets [Roll Forward]          
Beginning Balance     $ 61.0    
Additions     2.4    
Amortization $ (1.3) $ (1.4) (2.7) $ (2.8)  
Ending Balance 60.7   60.7    
Accumulated Amortization 17.5   17.5   $ 14.8
Estimated Annual Amortization Expense for Definite-Lived Intangible Assets [Abstract]          
Remainder of 2018 2.8   2.8    
2019 5.2   5.2    
2020 5.0   5.0    
2021 4.9   4.9    
2022 4.6   4.6    
Thereafter 38.2   38.2    
Intangible Assets Acquired     2.4    
Intangible Assets [Abstract]          
Total Intangible Assets 77.3   77.3   $ 77.6
Total Intangible Assets, Amortization (1.3) $ (1.4) $ (2.7) $ (2.8)  
Weighted Average [Member]          
Definite-Lived Intangible Assets [Roll Forward]          
Remaining Useful Life (Years)     18 years    
Trademarks and Trade Names [Member]          
Indefinite-Lived Intangible Assets [Roll Forward]          
Beginning Balance     $ 16.6    
Additions     0.0    
Ending Balance 16.6   16.6    
Customer Relationships [Member]          
Definite-Lived Intangible Assets [Roll Forward]          
Beginning Balance     54.7    
Additions     0.2    
Amortization     (2.1)    
Ending Balance 52.8   $ 52.8    
Remaining Useful Life (Years)     20 years    
Intangible Assets [Abstract]          
Total Intangible Assets, Amortization     $ (2.1)    
Developed Technology and Other [Member]          
Definite-Lived Intangible Assets [Roll Forward]          
Beginning Balance [1]     6.3    
Additions [1]     2.2    
Amortization [1]     (0.6)    
Ending Balance [1] $ 7.9   7.9    
Intangible Assets [Abstract]          
Total Intangible Assets, Amortization [1]     $ (0.6)    
Developed Technology and Other [Member] | Minimum [Member]          
Definite-Lived Intangible Assets [Roll Forward]          
Remaining Useful Life (Years)     1 year    
Developed Technology and Other [Member] | Maximum [Member]          
Definite-Lived Intangible Assets [Roll Forward]          
Remaining Useful Life (Years)     11 years    
Developed Technology and Other [Member] | Weighted Average [Member]          
Definite-Lived Intangible Assets [Roll Forward]          
Remaining Useful Life (Years)     6 years    
[1] Developed Technology and Other includes patents, non-compete agreements, land easements and trade names with finite lives.