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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets [Table Text Block]
The balance of intangible assets, net, for the year ended December 31, 2019:
 
December 31,
2018

 
 Amortization
 
Other (b)
 
December 31,
2019

Millions
 
 
 
 
 
 
 
Intangible Assets
 
 
 
 
 
 
 
Definite-Lived Intangible Assets
 
 
 
 
 
 
 
Customer Relationships

$50.7

 
$(1.1)
 
$(49.6)
 
—

Developed Technology and Other (a)
7.5

 
(0.4)
 
(6.1)
 

$1.0

Total Definite-Lived Intangible Assets
58.2

 
(1.5)
 
(55.7)
 
1.0

Indefinite-Lived Intangible Assets
 
 
 
 
 
 
 
Trademarks and Trade Names
16.6

 
n/a
 
(16.6)
 
—

Total Intangible Assets

$74.8

 
$(1.5)
 
$(72.3)
 

$1.0

(a)
Developed Technology and Other includes land easements and trade names with finite lives.