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Contingencies, Environmental and Legal Matters (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
 (amounts in millions)
2015
 
2014
 
2015
 
2014
AROs, beginning of period
$
17.7

 
$
5.4

 
$
18.5

 
$
4.8

Acquisitions
—

 
0.1

 
0.4

 
0.4

Accretion expense
0.2

 
0.2

 
0.7

 
0.5

Remeasurements
0.5

 
—

 
(0.2
)
 
—

Payments
(0.4
)
 
—

 
(0.4
)
 
—

Foreign currency adjustments
(0.2
)
 
(0.2
)
 
(1.2
)
 
(0.2
)
AROs, end of period
$
17.8

 
$
5.5

 
$
17.8

 
$
5.5