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Postretirement Benefits Other Than Pensions - Benefit Payments Net, Modernization Act Subsidy (Details) - Other Postretirement Benefit Plan, Defined Benefit [Member] $ in Millions | Dec. 31, 2015 USD ($)
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Defined Benefit Plan Disclosure [Line Items] |
Excluding Medicare Part D Subsidy Year One | $ 3.6
Expected Medicare Part D Subsidy, Year One | (0.3)
Net OPEB Benefits Year One | 3.3
Excluding Medicare Part D Subsidy, Year Two | 3.6
Expected Medicare Part D Subsidy, Year Two | (0.3)
Net OPEB Benefits Year Two | 3.3
Excluding Medicare Part D Subsidy, Year Three | 3.5
Expected Medicare Part D Subsidy, Year Three | (0.3)
Net OPEB Benefits Year Three | 3.2
Excluding Medicare Part D Subsidy, Year Four | 3.4
Expected Medicare Part D Subsidy, Year Four | (0.3)
Net OPEB Benefits Year Four | 3.1
Excluding Medicare Part D Subsidy, Year Five | 3.2
Expected Medicare Part D Subsidy, Year Five | (0.3)
Net OPEB Benefits Year Five | 2.9
Excluding Medicare Part D Subsidy Fiscal Years Thereafter | 13.5
Expected Medicare Part D Subsidy, Five Fiscal Years Thereafter | (1.5)
Net OPEB Benefits Five Fiscal Years Thereafter | $ 12.0

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- Definition Amount of the prescription drug subsidy receipts to be received in the next 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of the prescription drug subsidy receipts to be received in 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of the prescription drug subsidy receipts to be received in the third 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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