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Asset Retirement Obligation - Schedule of Change in Asset Retirement Obligation (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
As of December 31, 2013 $ 31.7
Accretion expense 1.7
Additions 0.2
Liabilities settled (0.8)
Foreign currency translation adjustments (0.5)
As of September 30, 2014 $ 32.3