Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Gain or Loss
-URI http://asc.fasb.org/extlink&oid=49168827

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512171

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ 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 (h)(2)
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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 715
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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

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Defined Benefit Plans - Components of Net Periodic Benefit Cost for Pension and Postretirement Benefits (Detail) - USD ($)	3 Months Ended			12 Months Ended
	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Recognition of actuarial losses (gains)		$ 2,500,000		$ 1,900,000	$ 8,600,000	$ 13,700,000
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost				9,600,000	11,500,000
Interest cost				34,400,000	33,700,000
Recognition of actuarial losses (gains)				11,700,000	(54,100,000)
Amortization of prior service cost (credits)				0
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost					100,000
Interest cost				300,000	600,000
Recognition of actuarial losses (gains)	$ 900,000		$ 600,000	1,600,000	(1,300,000)
Amortization of prior service cost (credits)	$ 10,700,000			(5,100,000)
Net Periodic Benefit Cost \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost				9,600,000	11,500,000	10,400,000
Interest cost				34,400,000	33,700,000	32,900,000
Expected return on plan assets				(37,200,000)	(40,200,000)	(42,200,000)
Recognition of actuarial losses (gains)					2,900,000	12,500,000
Amortization of prior service cost (credits)					100,000	100,000
Net periodic benefit cost				6,800,000	8,000,000	13,700,000
Net Periodic Benefit Cost \| Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost					100,000	100,000
Interest cost				300,000	600,000	800,000
Recognition of actuarial losses (gains)				1,900,000	(400,000)	1,200,000
Amortization of prior service cost (credits)				(13,500,000)	(13,500,000)	(27,600,000)
Net periodic benefit cost				$ (11,300,000)	$ (13,200,000)	$ (25,500,000)