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Pensions and Other Post-retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |
Period of amortization for actuarial gains and losses | 10 years |  |
Estimated contributions by employer to pension plans | $ 6.2 |  |
Percentage increase in health care benefit cost | 6.50% |  |
Percentage decrease in health care benefits for successive year | 0.50% | 0.50% |
Estimated future percentage of health care benefits | 4.50% |  |
Percentage of change in assumed health care cost trend rate | 1.00% |  |
Increase or decrease in other postretirement obligations | $ 1.1 |  |
Increase or decrease in current year plan expense | 1.0 |  |
Defined contribution pension plan expense | 6.8 | $ 6.5 | $ 5.8
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated benefit payments, 2016 | 20.2 |  |
Estimated benefit payments, 2017 | 21.0 |  |
Estimated benefit payments, 2018 | 22.0 |  |
Estimated benefit payments, 2019 | 22.7 |  |
Estimated benefit payments, 2020 | 24.3 |  |
Estimated benefit payments, five years thereafter | 139.2 |  |
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated benefit payments, 2016 | 1.4 |  |
Estimated benefit payments, 2017 | 1.5 |  |
Estimated benefit payments, 2018 | 1.7 |  |
Estimated benefit payments, 2019 | 1.8 |  |
Estimated benefit payments, 2020 | 1.8 |  |
Estimated benefit payments, five years thereafter | $ 8.5 |  |

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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + 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 Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 (f) -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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