v3.5.0.2

Employee Retirement Plans - Defined Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 01, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Effect of one-percentage-point decrease in the aggregate of service and interest cost components of annual expense |  | $ 0.1 |  |  |
Effect of one-percentage-point increase in the aggregate of service and interest cost components of annual expense |  | $ 0.1 |  |  |
Pension Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement loss |  |  | $ 5.8 |  |
Discount rate |  | 4.34% | 3.98% | 4.81% |
Spot rate for interest cost |  | 3.97% | 4.81% | 4.16% |
Expected contributions in the next fiscal year |  | $ 2.0 |  |  |
OPEB Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Changes in OPEB benefit obligation |  | $ (29.8) |  |  |
Discount rate |  | 3.61% | 3.90% | 4.65% | 3.59%
Increase (decrease) in service cost due to remeasurement |  | $ (0.2) |  |  |
Increase (decrease) in interest cost due to remeasurement |  | $ (0.2) |  |  |
Defined benefit plan weighted average rates, service cost |  | 3.59% |  |  |
Defined benefit plan weighted average rates, interest cost |  | 3.59% |  |  |
Spot rate for interest cost |  | 3.60% | 4.65% | 4.39% |
Expected contributions in the next fiscal year |  | $ 7.3 |  |  |
OPEB Benefits [Member] | Minimum [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Spot rate for service cost |  | 0.65% |  |  |
Spot rate for interest cost |  | 0.65% |  |  |
OPEB Benefits [Member] | Maximum [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Spot rate for service cost |  | 5.01% |  |  |
Spot rate for interest cost |  | 5.01% |  |  |
OPEB Benefits [Member] | Pension Benefits [Member] | Estimated [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan weighted average rates, service cost | 4.37% |  |  |  |
Defined benefit plan weighted average rates, interest cost | 4.37% |  |  |  |
Estimated increase (decrease) in service cost | $ (7.0) |  |  |  |
Estimated increase (decrease) in interest cost | $ (7.0) |  |  |  |
OPEB Benefits [Member] | Pension Benefits [Member] | Estimated [Member] | Minimum [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Spot rate for service cost | 0.92% |  |  |  |
Spot rate for interest cost | 0.92% |  |  |  |
OPEB Benefits [Member] | Pension Benefits [Member] | Estimated [Member] | Maximum [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Spot rate for service cost | 4.97% |  |  |  |
Spot rate for interest cost | 4.97% |  |  |  |

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- Definition The interest rate used to adjust for the time value of money for the plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + 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 (m) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + 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 (m) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=49173939 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + 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 (g) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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