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Contingencies, Environmental and Legal Matters (Tables)
 6 Months Ended
Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
Changes in the Company’s AROs were as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 (amounts in millions)
2015
 
2014
 
2015
 
2014
AROs, beginning of period
$
17.4

 
$
4.9

 
$
18.5

 
$
4.8

Acquisitions
0.4

 
0.3

 
0.4

 
0.3

Accretion expense
0.2

 
0.2

 
0.5

 
0.3

Remeasurements
(0.7
)
 
—

 
(0.7
)
 
—

Foreign currency adjustments
0.4

 
—

 
(1.0
)
 
—

AROs, end of period
$
17.7

 
$
5.4

 
$
17.7

 
$
5.4