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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Definite-Lived Intangible Assets [Roll Forward]      
Beginning Balance $ 65.6    
Additions [1] 0.9    
Amortization (5.5) $ (5.2) $ (4.0)
Ending Balance 61.0 65.6  
Definite-Lived Intangible Assets, Estimated Annual Amortization Expense [Abstract]      
2018 5.3    
2019 5.0    
2020 4.7    
2021 4.6    
2022 4.3    
Thereafter 37.1    
Intangible Assets [Abstract]      
Total Intangible Assets 77.6 82.2  
Total Intangible Assets, Additions [1] 0.9    
Total Intangible Assets, Amortization (5.5) (5.2) $ (4.0)
Accumulated Amortization $ 14.8 9.3  
Weighted Average [Member]      
Definite-Lived Intangible Assets [Roll Forward]      
Useful Life (Years) 7 years    
Trademarks and Trade Names [Member]      
Indefinite-Lived Intangible Assets [Roll Forward]      
Beginning Balance $ 16.6    
Additions [1] 0.0    
Ending Balance 16.6 16.6  
Customer Relationships [Member]      
Definite-Lived Intangible Assets [Roll Forward]      
Beginning Balance 59.3    
Additions [1] 0.0    
Amortization (4.6)    
Ending Balance 54.7 59.3  
Intangible Assets [Abstract]      
Total Intangible Assets, Amortization $ (4.6)    
Customer Relationships [Member] | Maximum [Member]      
Definite-Lived Intangible Assets [Roll Forward]      
Useful Life (Years) 20 years    
Developed Technology and Other [Member]      
Definite-Lived Intangible Assets [Roll Forward]      
Beginning Balance [2] $ 6.3    
Additions [1],[2] 0.9    
Amortization [2] (0.9)    
Ending Balance [2] 6.3 $ 6.3  
Intangible Assets [Abstract]      
Total Intangible Assets, Amortization [2] $ (0.9)    
Developed Technology and Other [Member] | Minimum [Member]      
Definite-Lived Intangible Assets [Roll Forward]      
Useful Life (Years) 1 year    
Developed Technology and Other [Member] | Maximum [Member]      
Definite-Lived Intangible Assets [Roll Forward]      
Useful Life (Years) 11 years    
Developed Technology and Other [Member] | Weighted Average [Member]      
Definite-Lived Intangible Assets [Roll Forward]      
Useful Life (Years) 19 years    
[1] Additions resulting from the September 1, 2017, acquisition of Tonka Water. (See Note 6. Acquisitions.)
[2] Developed Technology and Other includes patents, non-compete agreements, land easements and trade names with finite lives.