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Employee Benefit Plans - Projected future postretirement benefit payments and future receipts from the federal subsidy (Detail) - Other Postretirement Benefits Plan [Member] $ in Millions | Dec. 31, 2017 USD ($)
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Defined benefit plan, expected future benefit payment |
2018 | $ 2.5
2019 | 2.2
2020 | 2.1
2021 | 2.0
2022 | 1.9
Next five years | 7.3
Defined benefit plan, expected future receipts from federal subsidy |
2018 | 0.1
2019 | 0.1
2020 | 0.1
2021 | 0.1
2022 | 0.1
Next five years | $ 0.3

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- Definition Defined Benefit Plan, Expected Future Receipts From Federal Subsidy [Abstract] + References No definition available. + Details
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- Definition Defined benefit plan expected future receipts from federal subsidy after year five. + References No definition available. + Details
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- Definition Defined benefit plan expected future receipts from federal subsidy next twelve months. + References No definition available. + Details
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- Definition Defined benefit plan expected future receipts from federal subsidy year five. + References No definition available. + Details
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- Definition Defined benefit plan expected future receipts from federal subsidy year four. + References No definition available. + Details
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- Definition Defined benefit plan expected future receipts from federal subsidy year three. + References No definition available. + Details
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- Definition Defined benefit plan expected future receipts from federal subsidy year two. + References No definition available. + Details
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- References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108410482&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year. + 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 (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year. + 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 (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year. + 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 (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year. + 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 (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Details
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