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Postretirement Benefits Contributions, Benefit Payments and Other (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Expected Benefit Payments [Abstract] |  |  |
Amortization of prior service costs (credits) for former/inactive employees |  | $ 0.6 | $ 1.3
Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  | 1,035.5 | $ 1,315.4
Expected Benefit Payments [Abstract] |  |  |
Company contributions expected to be made in 2015 | [1] | 38.8 |
2015 |  | 73.0 |
2016 |  | 73.5 |
2017 |  | 73.4 |
2018 |  | 73.0 |
2019 |  | 72.2 |
2020-2024 |  | 345.8 |
Defined Benefit Plan Estimated Future Employer Required Contributions In Next Fiscal Year Qualified Plan |  | 35.0 |
Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year Unfunded Plan |  | 3.8 |
Other Postretirement Benefit Plans [Member] |  |  |
Expected Benefit Payments [Abstract] |  |  |
Company contributions expected to be made in 2015 | [1] | 4.4 |
2015 |  | 4.4 |
2016 |  | 4.2 |
2017 |  | 4.0 |
2018 |  | 3.8 |
2019 |  | 3.5 |
2020-2024 |  | $ 13.3 |
[1] | The Company currently anticipates contributing approximately $35.0 million to fund the qualified pension plans and approximately $3.8 million to cover benefit payments in the unfunded, nonqualified pension plan in 2016. Company contributions are subject to change based on market conditions or Company discretion.

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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation for qualified former or inactive employees. + References No definition available. + Details
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- Definition The employer's best estimate, as soon as it can be reasonably determined, of required contributions expected to be paid to the unqualified plan during the next fiscal year beginning after the date of the latest statement of financial position. + References No definition available. + Details
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- Definition The employer's best estimate, as soon as it can be reasonably determined, of required contributions expected to be paid to the qualified plan during the next fiscal year beginning after the date of the latest statement of financial position. + 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 benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 (f) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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