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Pension and Postretirement Health and Life Benefits (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |  |  |  |  |  | $ 26.4
Actuarial (gain) loss from remeasurement, net |  |  |  |  |  |  |  | 29.6
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  |  |  |  | 4.50% |  |  |
Defined Contribution Plan, Cost Recognized |  |  | $ 0.9 | $ 4.1 |  |  |  | 3.0
Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Expected defined benefit plan contributions for next fiscal year for non-qualified plans |  |  |  |  |  |  | $ 4.2 |
Expected defined benefit plan contributions for next fiscal year for postretirement health and life benefit plans |  |  |  |  |  |  | $ 5.4 |
Pension Plan, Defined Benefit [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 832.8 |  | 961.4 |  |  |  |  | 832.8
Defined Benefit Plan, Net Periodic Benefit Cost |  |  | 5.5 |  |  | $ (6.2) |  | $ (4.5)
Approximate Number of Plan Participants | 5,000 |  |  |  |  |  |  | 5,000
Defined Benefit Plan, Contributions by Employer |  |  | 0.0 |  |  | 20.3 |  | $ 8.0
Actuarial (gain) loss from remeasurement, net |  |  | $ 18.7 |  | $ 3.9 | $ 96.0 |  | $ (55.2)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 4.50% | 4.40% | 4.10% | 4.30% |  | 4.30% |  | 4.50%
Defined Benefit Plan, Expected Return on Plan Assets |  |  | $ 13.1 |  |  | $ 38.5 |  | $ 47.4
Other Postretirement Benefit Plan, Defined Benefit [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  | 6.1 |  |  | 7.0 |  | $ 21.9
Approximate Number of Plan Participants | 4,000 |  |  |  |  |  |  | 4,000
Defined Benefit Plan, Contributions by Employer |  |  | (0.3) |  |  | 0.0 |  | $ 0.2
Actuarial (gain) loss from remeasurement, net |  |  | $ 4.3 |  |  | $ 8.3 |  | $ (30.2)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 4.20% |  | 3.80% | 4.00% |  | 4.00% |  | 4.20%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase |  |  | 2.00% | 2.00% |  | 2.00% |  |
Defined Benefit Plan, Expected Return on Plan Assets |  |  | $ 0.4 |  |  | $ 1.5 |  | $ 0.8
Cost of Sales [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |  |  |  |  |  | 24.7
Actuarial (gain) loss from remeasurement, net | $ 48.8 |  |  |  |  |  |  |
Cost of Sales [Member] | Pension Plan, Defined Benefit [Member] |  |  |  |  |  |  |  |
Actuarial (gain) loss from remeasurement, net |  | $ 21.6 |  |  |  |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |  |  |  |  |  | $ 1.7
Actuarial (gain) loss from remeasurement, net | $ 1.7 |  |  |  |  |  |  |
Selling, General and Administrative Expenses [Member] | Pension Plan, Defined Benefit [Member] |  |  |  |  |  |  |  |
Actuarial (gain) loss from remeasurement, net |  | $ 3.2 |  |  |  |  |  |

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- Definition Expected defined benefit plan contributions for next fiscal year for non-qualified plans + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=49168827 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)(4) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + 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 (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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