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Benefits Expected to be Paid from Plans Assets (Parenthetical) (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2016
Includes Plan No 1 and No 2 One Time Voluntary Lump Sum Offer | Lump Sums Plan No. 1 |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Distributions from existing plan assets | $ 48.4 |
Includes Plan No 1 and No 2 One Time Voluntary Lump Sum Offer | Lump Sums Plan No. 2 |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Distributions from existing plan assets | $ 2.0 |
Includes Plan No 1 and No 2 Single Lump Sum | Lump Sums Plan No. 1 |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Distributions from existing plan assets |  | $ 15.7
Includes Plan No 1 and No 2 Single Lump Sum | Lump Sums Plan No. 2 |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Distributions from existing plan assets |  | $ 1.6

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- Definition Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] + References No definition available. + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=49170737 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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