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Postretirement Benefits Schedule of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | [1] | Sep. 30, 2017 | [1] | Jul. 01, 2017 | [1] | Apr. 01, 2017 | [1] | Dec. 31, 2016 | [1] | Oct. 01, 2016 | [1] | Jul. 02, 2016 | [1] | Apr. 02, 2016 | [1] | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement Loss | $ 96.6 | $ 0.0 | $ 0.0 | $ 0.0 | $ 55.1 | $ 0.0 | $ 0.0 | $ 0.0 | $ 96.6 | [1] | $ 55.1 | [1] | $ 82.3
Pension Plans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Cost |  |  |  |  |  |  |  |  | 28.4 |  | 35.8 |  | 47.9
Expected Return on Plan Assets |  |  |  |  |  |  |  |  | (33.5) |  | (38.5) |  | (55.7)
Amortization of Prior Service Credits |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 0.0
Amortization of Net Actuarial Losses |  |  |  |  |  |  |  |  | 14.4 |  | 17.4 |  | 19.5
Settlement Loss |  |  |  |  |  |  |  |  | 96.6 |  | 55.1 |  | 82.3
Net Pension and Other Benefit Costs |  |  |  |  |  |  |  |  | 105.9 |  | 69.8 |  | 94.0
Other Postretirement Benefit Plans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Cost |  |  |  |  |  |  |  |  | 1.2 |  | 1.4 |  | 1.8
Expected Return on Plan Assets |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 0.0
Amortization of Prior Service Credits |  |  |  |  |  |  |  |  | (0.7) |  | (0.7) |  | (0.7)
Amortization of Net Actuarial Losses |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 1.3
Settlement Loss |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 0.0
Net Pension and Other Benefit Costs |  |  |  |  |  |  |  |  | $ 0.5 |  | $ 0.7 |  | $ 2.4
[1] | (B) Pension settlement charges are discussed in Note 17 – Postretirement Benefits in the Notes to Consolidated Financial Statements.

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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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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to 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)(2) -URI http://asc.fasb.org/extlink&oid=82843861&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 (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + 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)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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