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Summary of Significant Accounting Policies Allowance for Uncollectible Accounts Receivable (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Allowance for Doubtful Accounts Receivable $ 1.6us-gaap_AllowanceForDoubtfulAccountsReceivable $ 1.9us-gaap_AllowanceForDoubtfulAccountsReceivable