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Employee Benefits - Plan Assets and Investment Policy (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Employee Benefits |  |
Weighted-average asset allocations (as a percent) | 100.00% | 100.00%
Fair value of plan assets | $ 73.3 | $ 70.2
Level 1 |  |
Employee Benefits |  |
Fair value of plan assets | 52.7 | 50.3
Level 2 |  |
Employee Benefits |  |
Fair value of plan assets | 20.6 | 19.9
Equity securities |  |
Employee Benefits |  |
Fair value of plan assets | 23.5 | 24.8
Equity securities | Level 1 |  |
Employee Benefits |  |
Fair value of plan assets | 23.5 | 24.8
U.S. government, state, and agency |  |
Employee Benefits |  |
Fair value of plan assets | 7.3 | 7.9
U.S. government, state, and agency | Level 2 |  |
Employee Benefits |  |
Fair value of plan assets | 7.3 | 7.9
Corporate debt securities |  |
Employee Benefits |  |
Fair value of plan assets | 10.3 | 9.7
Corporate debt securities | Level 2 |  |
Employee Benefits |  |
Fair value of plan assets | 10.3 | 9.7
Mutual funds |  |
Employee Benefits |  |
Fair value of plan assets | 29.3 | 23.4
Mutual funds | Level 1 |  |
Employee Benefits |  |
Fair value of plan assets | 26.3 | 21.1
Mutual funds | Level 2 |  |
Employee Benefits |  |
Fair value of plan assets | 3.0 | 2.3
Interest and non-interest bearing cash |  |
Employee Benefits |  |
Fair value of plan assets | 2.9 | 4.4
Interest and non-interest bearing cash | Level 1 |  |
Employee Benefits |  |
Fair value of plan assets | $ 2.9 | $ 4.4
Equity securities |  |
Employee Benefits |  |
Weighted-average asset allocations (as a percent) | 58.00% | 56.00%
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% | 38.00%
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) | 4.00% | 6.00%
Target allocation |  |
Target allocation, minimum (as a percent) | 0.00% |
Target allocation, maximum (as a percent) | 10.00% |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=64937038&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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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