v3.5.0.2

Employee Retirement Plans - Summary of Plan's Investments Measured at Fair Value and Target and Current Allocation, by Level Within Fair Value Hierarchy (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | $ 594.8 | $ 638.2
Short-Term Investments Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | $ 8.5 | $ 10.2
Percentage of Plan Assets | 1.00% | 2.00%
U.S. Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | $ 253.7 | $ 275.8
Target Allocation (as a percent) | 44.00% | 41.00%
Percentage of Plan Assets | 43.00% | 43.00%
US Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | $ 219.1 | $ 227.7
Target Allocation (as a percent) | 37.00% | 38.00%
Percentage of Plan Assets | 37.00% | 36.00%
International Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | $ 113.4 | $ 123.1
Target Allocation (as a percent) | 19.00% | 18.00%
Percentage of Plan Assets | 19.00% | 19.00%
Long-Biased Hedge Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) |  | $ 0.2
Target Allocation (as a percent) |  | 3.00%
Consumer Discretionary Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | $ 2.8 | $ 4.3
Consumer Staples Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 4.3 | 6.1
Energy Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 0.2 | 1.3
Finance Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 0.4 | 2.3
Health Care Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 4.6 | 9.9
Index funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 117.8 | 141.3
Industrials Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 1.3 | 3.5
Information Technology Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 3.5 | 3.7
Capital Appreciation Mutual Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 56.1 | 39.4
Small Cap Growth Mutual Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 7.0 | 7.2
Pooled Equity Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 55.7 | 55.5
Other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) |  | 1.3
Western Assets Total Return Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 80.6 | 85.5
Blackrock Investments Institutional [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 68.7 | 70.8
Other Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 69.8 | 71.4
International Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 53.6 | 76.5
Equity Securities Measured at Net Asset Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 3.6 | 5.0
Euro Pacific Growth Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 49.8 | 35.4
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 1.6 | 2.0
Fixed Income Securities Measured at Net Asset Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 4.8 | 4.2
Real Estate Partnership Measured at Net Asset Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 0.1 | 1.2
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 207.9 | 124.4
Level 1 [Member] | U.S. Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 80.2 | 79.0
Level 1 [Member] | US Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 69.6 |
Level 1 [Member] | International Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 58.1 | 45.4
Level 1 [Member] | Consumer Discretionary Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 2.8 | 4.3
Level 1 [Member] | Consumer Staples Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 4.3 | 6.1
Level 1 [Member] | Energy Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 0.2 | 1.3
Level 1 [Member] | Finance Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 0.4 | 2.3
Level 1 [Member] | Health Care Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 4.6 | 9.9
Level 1 [Member] | Industrials Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 1.3 | 3.5
Level 1 [Member] | Information Technology Sector [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 3.5 | 3.7
Level 1 [Member] | Capital Appreciation Mutual Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 56.1 | 39.4
Level 1 [Member] | Small Cap Growth Mutual Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 7.0 | 7.2
Level 1 [Member] | Other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) |  | 1.3
Level 1 [Member] | Other Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 69.6 |
Level 1 [Member] | International Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 6.7 | 8.0
Level 1 [Member] | Euro Pacific Growth Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 49.8 | 35.4
Level 1 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 1.6 | 2.0
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 378.4 | 503.2
Level 2 [Member] | Short-Term Investments Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 8.5 | 10.2
Level 2 [Member] | U.S. Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 173.5 | 196.8
Level 2 [Member] | US Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 149.5 | 227.7
Level 2 [Member] | International Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 46.9 | 68.5
Level 2 [Member] | Index funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 117.8 | 141.3
Level 2 [Member] | Pooled Equity Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 55.7 | 55.5
Level 2 [Member] | Western Assets Total Return Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 80.6 | 85.5
Level 2 [Member] | Blackrock Investments Institutional [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 68.7 | 70.8
Level 2 [Member] | Other Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | 0.2 | 71.4
Level 2 [Member] | International Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets (in dollars) | $ 46.9 | $ 68.5

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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