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Related Party Transactions (Details) (ATC [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
ATC [Member] |  |  |
Related party transaction [Line Items] |  |  |
Related party expenses | $ 27.7 | $ 25.3 | $ 25.0
Due from Related Parties | $ 0.2 | $ 0.2 | $ 0.2

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