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Basis of Presentation (Narrative) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Cumulative effect of new accounting principle in period of adoption | $ 0.4
Retained Earnings [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Cumulative effect of new accounting principle in period of adoption | 0.4
Accounting Standards Update 2017-07 |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | $ 0.1

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