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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of amounts for goodwill and changes to carrying value by operating segment
The amounts for goodwill and changes to carrying value by reportable segment are as follows:
(millions)
Region
One
 
Region
Two
 
Region
Three
 
Total
Balance as of December 31, 2014
$
339.1

 
$
62.7

 
$
31.1

 
$
432.9

Foreign currency translation
(0.7
)
 
—

 
—

 
(0.7
)
Disposals (1)
(0.9
)
 
—

 
—

 
(0.9
)
Balance as of December 31, 2015
$
337.5

 
$
62.7

 
$
31.1

 
$
431.3

Foreign currency translation
0.1

 
—

 
—

 
0.1

Balance as of December 31, 2016
$
337.6

 
$
62.7

 
$
31.1

 
$
431.4


(1) In August 2015, certain assets, which met the definition of a business, were sold to a third-party in an arms-length transaction (see also Note 1. Significant Accounting Policies and Practices and Note 10. Fair Value for further detail on the sale of the business). The sale resulted in the disposal of specifically identifiable goodwill associated with the business of $0.9 million from Region One.