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Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 804.7 |
Other comprehensive income, net of tax | 1.3 |
Ending balance | 798.6 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (37.1) | $ (31.3)
Reclassification from AOCI, Current Period, Tax | (0.5) | (0.4)
Other comprehensive income, net of tax | 0.9 | 0.8
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0.9 | 0.7
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss) | 0.0 | 0.1
Ending balance | (36.2) | (30.5)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 0.2 | 0.1
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 1.2 | 1.0
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 0.8 | (0.1)
OCI, before Reclassifications, before Tax, Attributable to Parent | 1.1 | 0.0
Other Comprehensive Income (Loss) before Reclassifications, Tax | (0.4) | 0.0
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0.7 | 0.0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | (0.9) | 0.0
Reclassification from AOCI, Current Period, Tax | 0.3 | 0.0
Other comprehensive income, net of tax | 0.1 | 0.0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (0.6) | 0.0
Ending balance | 0.9 | (0.1)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (0.2) | (0.1)
OCI, before Reclassifications, before Tax, Attributable to Parent | 0.0 | 0.0
Other Comprehensive Income (Loss) before Reclassifications, Tax | 0.0 | 0.0
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0.0 | 0.0
Ending balance | (0.2) | (0.1)
AOCI Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Other comprehensive income, net of tax | 1.3 |
Ending balance | (35.4) | (30.8)
Foreign Exchange Contract [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (0.1) | (0.2)
OCI, before Reclassifications, before Tax, Attributable to Parent | 0.0 | 0.2
Other Comprehensive Income (Loss) before Reclassifications, Tax | 0.0 | (0.1)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0.0 | 0.1
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 0.2 | 0.0
Reclassification from AOCI, Current Period, Tax | (0.1) | 0.0
Other comprehensive income, net of tax | 0.1 | 0.1
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0.1 | 0.0
Ending balance | 0.0 | (0.1)
Alloy Metal Hedge [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (0.1) | 0.0
OCI, before Reclassifications, before Tax, Attributable to Parent | 0.3 | 0.0
Other Comprehensive Income (Loss) before Reclassifications, Tax | (0.1) | 0.0
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0.2 | 0.0
Ending balance | $ 0.1 | $ 0.0

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- Definition Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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