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Benefit Plans (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Current liabilities | $ (2.2) | $ (2.2)
Noncurrent liabilities | (53.4) | (75.6)
Pension Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Current liabilities | (1.5) | (1.5)
Noncurrent liabilities | (47.0) | (68.3)
Total liabilities | (48.5) | (69.8)
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Current liabilities | (0.7) | (0.7)
Noncurrent liabilities | (6.4) | (7.3)
Total liabilities | $ (7.1) | $ (8.0)

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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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