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Postretirement Benefits Contributions, Benefit Payments and Other (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Expected Benefit Payments [Abstract] |  |
Defined Benefit Plan Estimated Future Employer Required Contributions In Next Fiscal Year Qualified Plan | $ 70.0 |
Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year Unfunded Plan | 3.8 |
Pension Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Accumulated Benefit Obligation | 716.9 | $ 921.5
Expected Benefit Payments [Abstract] |  |
Company Contributions Expected to be Made in 2017 | 73.8 |
2018 | 44.4 |
2019 | 45.0 |
2020 | 45.3 |
2021 | 45.1 |
2022 | 45.1 |
2023-2027 | 221.6 |
Other Postretirement Benefit Plans [Member] |  |
Expected Benefit Payments [Abstract] |  |
Company Contributions Expected to be Made in 2017 | 3.7 |
2018 | 3.7 |
2019 | 3.6 |
2020 | 3.4 |
2021 | 3.1 |
2022 | 2.9 |
2023-2027 | $ 12.6 |

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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 Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + 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=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year. + 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=82843861&loc=d3e1928-114920 + Details
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