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Employee Benefits (Details 3) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Employee Benefits |  |
Weighted-average asset allocations (as a percent) | 100.00% | 100.00%
Target allocation |  |
Fair value of plan assets | $ 70.2 | $ 58.9
Level 1 |  |
Target allocation |  |
Fair value of plan assets | 55.1 | 42.3
Level 2 |  |
Target allocation |  |
Fair value of plan assets | 15.1 | 16.6
U.S. government, state, and agency |  |
Target allocation |  |
Fair value of plan assets | 6.3 | 8.1
U.S. government, state, and agency | Level 2 |  |
Target allocation |  |
Fair value of plan assets | 6.3 | 8.1
Corporate debt securities |  |
Target allocation |  |
Fair value of plan assets | 8.4 | 7.9
Corporate debt securities | Level 2 |  |
Target allocation |  |
Fair value of plan assets | 8.4 | 7.9
Mutual funds |  |
Target allocation |  |
Fair value of plan assets | 28.3 | 18.6
Mutual funds | Level 1 |  |
Target allocation |  |
Fair value of plan assets | 27.9 | 18.0
Mutual funds | Level 2 |  |
Target allocation |  |
Fair value of plan assets | 0.4 | 0.6
Interest and non-interest bearing cash |  |
Target allocation |  |
Fair value of plan assets | 1.6 | 1.6
Interest and non-interest bearing cash | Level 1 |  |
Target allocation |  |
Fair value of plan assets | 1.6 | 1.6
Equity securities |  |
Employee Benefits |  |
Weighted-average asset allocations (as a percent) | 61.00% | 61.00%
Target allocation |  |
Target allocation, minimum (as a percent) | 50.00% |
Target allocation, maximum (as a percent) | 80.00% |
Fair value of plan assets | 25.6 | 22.7
Equity securities | Level 1 |  |
Target allocation |  |
Fair value of plan assets | $ 25.6 | $ 22.7
Debt securities |  |
Employee Benefits |  |
Weighted-average asset allocations (as a percent) | 37.00% | 36.00%
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) | 2.00% | 3.00%
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 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: 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=29635418&loc=d3e12355-114930 + 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 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: 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=28361610&loc=d3e2446-114920 + Details
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- Definition Target allocation minimum 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 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: 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=28361610&loc=d3e2446-114920 + 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=28361610&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=28361610&loc=d3e1928-114920 + Details
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