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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Definite-Lived Intangible Assets [Roll Forward]          
Beginning Balance     $ 61.0    
Additions     2.7    
Amortization $ (1.4) $ (1.3) (4.1) $ (4.1)  
Ending Balance 59.6   59.6    
Accumulated Amortization 18.9   18.9   $ 14.8
Estimated Annual Amortization Expense for Definite-Lived Intangible Assets [Abstract]          
Remainder of 2018 1.5   1.5    
2019 5.3   5.3    
2020 4.9   4.9    
2021 4.9   4.9    
2022 4.6   4.6    
Thereafter 38.4   38.4    
Intangible Assets [Abstract]          
Total Intangible Assets     77.6    
Total Intangible Assets - Additions     2.7    
Total Intangible Assets - Amortization (1.4) $ (1.3) (4.1) $ (4.1)  
Total Intangible Assets 76.2   $ 76.2    
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     (3.2)    
Ending Balance 51.7   $ 51.7    
Remaining Useful Life (Years)     19 years    
Intangible Assets [Abstract]          
Total Intangible Assets - Amortization     $ (3.2)    
Developed Technology and Other [Member]          
Definite-Lived Intangible Assets [Roll Forward]          
Beginning Balance [1]     6.3    
Additions [1]     2.5    
Amortization [1]     (0.9)    
Ending Balance [1] $ 7.9   7.9    
Intangible Assets [Abstract]          
Total Intangible Assets - Amortization [1]     $ (0.9)    
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)     10 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.