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Postretirement Health Care and Life Insurance Benefits (Details) - Postretirement Health Care and Life Insurance Benefits [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Components of net periodic postretirement benefit cost |  |  |  |
Service cost for benefits earned |  | $ 10.4 | $ 11.2 | $ 12.2
Interest cost on accumulated postretirement benefit obligation |  | 34.5 | 33.8 | 36.4
Amortization of prior service (credit) cost |  | (9.2) | (6.8) | 1.3
Amortization of actuarial loss |  | 20.4 | 24.9 | 14.5
Special termination benefits | [1] | 0.0 | 0.0 | 1.6
Total net periodic postretirement or pension cost |  | $ 56.1 | $ 63.1 | $ 66.0
[1] | Reflected in "Restructuring and pension settlement charges" in the consolidated statement of operations for the year ended December 31, 2014.

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit 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 (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit 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 (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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