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Contingencies, Environmental and Legal Matters (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
 (amounts in millions)
 
Year Ended December 31,
 
 
2016
 
2015
 
2014
AROs, beginning of period
 
$
17.5

 
$
18.5

 
$
4.8

Acquisitions
 
2.7

 
0.4

 
13.2

Additional obligations incurred
 
—

 
—

 
0.5

Accretion expense
 
1.2

 
1.0

 
0.7

Remeasurements
 
—

 
(0.2
)
 
—

Payments
 
(1.3
)
 
(0.4
)
 
(0.2
)
Foreign currency translation
 
(0.3
)
 
(1.8
)
 
(0.5
)
AROs, end of period
 
$
19.8

 
$
17.5

 
$
18.5