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Employee Benefits - Plan Assets and Investment Policy (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Employee Benefits |  |
Weighted-average asset allocations (as a percent) | 100.00% | 100.00%
Target allocation |  |
Fair value of plan assets | $ 70.2 | $ 72.4
Level 1 |  |
Target allocation |  |
Fair value of plan assets | 50.3 | 52.6
Level 2 |  |
Target allocation |  |
Fair value of plan assets | 19.9 | 19.8
Equity securities |  |
Target allocation |  |
Fair value of plan assets | 24.8 | 26.6
Equity securities | Level 1 |  |
Target allocation |  |
Fair value of plan assets | 24.8 | 26.6
U.S. government, state, and agency |  |
Target allocation |  |
Fair value of plan assets | 7.9 | 7.1
U.S. government, state, and agency | Level 2 |  |
Target allocation |  |
Fair value of plan assets | 7.9 | 7.1
Corporate debt securities |  |
Target allocation |  |
Fair value of plan assets | 9.7 | 10.0
Corporate debt securities | Level 2 |  |
Target allocation |  |
Fair value of plan assets | 9.7 | 10.0
Mutual funds |  |
Target allocation |  |
Fair value of plan assets | 23.4 | 25.3
Mutual funds | Level 1 |  |
Target allocation |  |
Fair value of plan assets | 21.1 | 22.6
Mutual funds | Level 2 |  |
Target allocation |  |
Fair value of plan assets | 2.3 | 2.7
Interest and non-interest bearing cash |  |
Target allocation |  |
Fair value of plan assets | 4.4 | 3.4
Interest and non-interest bearing cash | Level 1 |  |
Target allocation |  |
Fair value of plan assets | $ 4.4 | $ 3.4
Equity securities |  |
Employee Benefits |  |
Weighted-average asset allocations (as a percent) | 56.00% | 58.00%
Target allocation |  |
Target allocation, minimum (as a percent) | 50.00% |
Target allocation, maximum (as a percent) | 80.00% |
Debt securities |  |
Employee Benefits |  |
Weighted-average asset allocations (as a percent) | 38.00% | 37.00%
Target allocation |  |
Target allocation, minimum (as a percent) | 20.00% |
Target allocation, maximum (as a percent) | 60.00% |
Other |  |
Employee Benefits |  |
Weighted-average asset allocations (as a percent) | 6.00% | 5.00%
Target allocation |  |
Target allocation, minimum (as a percent) | 0.00% |
Target allocation, maximum (as a percent) | 10.00% |

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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 maximum percentage 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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