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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets [Table Text Block]
Balances of intangible assets, net, excluding goodwill as of September 30, 2017, are as follows:
 
December 31,
2016

 
Additions (a)
 
 Amortization
September 30,
2017

Millions
 
 
 
 
 
 
Intangible Assets
 
 
 
 
 
 
Definite-Lived Intangible Assets
 
 
 
 
 
 
Customer Relationships
$59.3
 
—

 
$(3.4)

$55.9

Developed Technology and Other (b)
6.3
 

$0.9

 
(0.7)
6.5

Total Definite-Lived Intangible Assets
65.6

 
0.9

 
(4.1)
62.4

Indefinite-Lived Intangible Assets
 
 
 
 
 
 
Trademarks and Trade Names
16.6

 
—

 
n/a
16.6

Total Intangible Assets

$82.2

 

$0.9

 
$(4.1)

$79.0


(a)
Additions resulting from the September 1, 2017, acquisition of Tonka Water. (See Note 3. Acquisitions.)    
(b)
Developed Technology and Other includes patents, non-compete agreements, land easements and trade names.