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Benefit Plans - Postretirement cost sensitivities (Details) - Postemployment Retirement Benefits $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Sensitivity to Trend Assumptions |
One-percentage point increase, effect on service cost and interest cost components | $ 1.0
One-percentage point increase, effect on year-end benefit obligations | 5.0
One-percentage point decrease, effect on service cost and interest cost components | (1.0)
One-percentage point decrease, effect on year-end benefit obligations | $ (7.0)

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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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