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Postretirement Benefits Other Than Pensions (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) employees | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations before Income Taxes | $ 44.2 | $ 68.3 | $ 52.1 | $ (3.5) | $ 40.6 | $ (33.2) | $ 2.6 | $ (6.5) | $ 161.1 | $ 3.5 | $ 100.3
Other Postretirement Benefit Plan, Defined Benefit [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of retired employees covered | employees |  |  |  |  |  |  |  |  | 475 |  |
Number of active employees covered | employees |  |  |  |  |  |  |  |  | 200 |  |
Plan Amendments |  |  |  |  |  |  |  |  | $ 0.0 | (11.0) |
Effect of one percentage point increase on accumulated postretirement benefit obligation |  |  |  |  |  |  |  |  | 0.6 | $ 0.6 |
Amounts that will be amortized from AOCI in next Fiscal Year |  |  |  |  |  |  |  |  | 3.0 |  |
Estimated future employer contributions in next fiscal year |  |  |  |  |  |  |  |  | $ 1.6 |  |
Medical Benefits [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Health care cost trend rate assumed for next fiscal year |  |  |  |  |  |  |  |  | 7.50% | 6.80% |
Health care cost trend rate assumed for future years |  |  |  |  |  |  |  |  | 4.80% | 5.00% |
Prescription Drug Benefits [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Health care cost trend rate assumed for next fiscal year |  |  |  |  |  |  |  |  | 10.00% | 10.30% |
Health care cost trend rate assumed for future years |  |  |  |  |  |  |  |  | 4.80% | 5.00% |

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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=49173939 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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