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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at December 31, 2015 | $ (124.9) |  |
Other comprehensive income (loss) before reclassifications, net of tax | (24.9) |  |
Amounts reclassified from AOCI, net of tax | 10.2 |  |
Other comprehensive income (loss) | (14.7) | $ 29.0 | $ (88.9)
Balance at December 31, 2016 | (139.6) | (124.9) |
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) [Line Items] |  |  |
Balance at December 31, 2015 | (103.3) |  |
Other comprehensive income (loss) before reclassifications, net of tax | (24.9) |  |
Amounts reclassified from AOCI, net of tax | 6.7 |  |
Other comprehensive income (loss) | (18.2) |  |
Balance at December 31, 2016 | (121.5) | (103.3) |
Treasury Lock | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at December 31, 2015 | (21.2) |  |
Other comprehensive income (loss) before reclassifications, net of tax | 0.0 |  |
Amounts reclassified from AOCI, net of tax | 3.5 |  |
Other comprehensive income (loss) | 3.5 |  |
Balance at December 31, 2016 | (17.7) | (21.2) |
Foreign Exchange Contract | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at December 31, 2015 | (0.4) |  |
Other comprehensive income (loss) before reclassifications, net of tax | 0.0 |  |
Amounts reclassified from AOCI, net of tax | 0.0 |  |
Other comprehensive income (loss) | 0.0 |  |
Balance at December 31, 2016 | $ (0.4) | $ (0.4) |

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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 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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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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