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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income by Component (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Balance at January 1, 2016 | $ (124.9) |
Other comprehensive income (loss) before reclassifications, net of tax | 3.1 |
Amounts reclassified from AOCI, net of tax | 4.9 |
Balance at June 30, 2016 | (116.9) |
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, before tax | (5.7) |
Net amount of settlement gains (losses) on derivative instruments included in accumulated OCI to be amortized over next 12 months, after tax | (3.5) |
Unfunded Employee Benefit Obligations |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Balance at January 1, 2016 | (103.3) |
Other comprehensive income (loss) before reclassifications, net of tax | 3.1 |
Amounts reclassified from AOCI, net of tax | 3.2 | [1]
Balance at June 30, 2016 | (97.0) |
Treasury Lock | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Balance at January 1, 2016 | (21.2) |
Other comprehensive income (loss) before reclassifications, net of tax | 0.0 |
Amounts reclassified from AOCI, net of tax | 1.7 | [2]
Balance at June 30, 2016 | (19.5) |
Foreign Exchange Contract | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Balance at January 1, 2016 | (0.4) |
Other comprehensive income (loss) before reclassifications, net of tax | 0.0 |
Amounts reclassified from AOCI, net of tax | 0.0 |
Balance at June 30, 2016 | $ (0.4) |
[1] | These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 10, Employee Benefit Plans and Other Postretirement Benefits, for additional information.
[2] | This AOCI component is included in interest expense, net. Amount relates to the amortization of the effective portion of treasury lock derivative instruments recorded in AOCI. The net amount of settlement gains or losses on derivative instruments included in AOCI to be amortized over the next 12 months is a net loss of $5.7 million ($3.5 million after tax). For a discussion of treasury lock derivative instrument activity, see Note 14, Derivative Instruments and Hedging Activities, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2015 Annual Report on Form 10-K.

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months, net of tax. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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