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New Accounting Pronouncements (Issued But Not Yet Adopted) (Details) - ASU 2017-07 - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Operating Income (Loss) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New accounting pronouncement, effect of adoption | $ 6.5 | $ 3.1
Other Nonoperating Income (Expense) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New accounting pronouncement, effect of adoption | $ (6.5) | $ (3.1)

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