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Employee Benefit Plans - Schedule of Plan Assets Using the Fair Value Hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | $ 150.4 | $ 340.8 |
Cash |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.9 | 2.0 |
Insurance group annuity contracts |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 14.5 | 106.5 |
Common/collective trust funds — Government debt |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Common/collective trust funds — Corporate and other non-government debt |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 38.4 | 60.6 |
Common/collective trust funds — Government, corporate and other non-government debt |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 55.3 | 98.7 |
Common/collective trust funds — Corporate equity |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 41.3 | 67.1 |
Common/collective trust funds — Customized strategy |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 5.9 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.9 | 2.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.9 | 2.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Insurance group annuity contracts |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust funds — Government debt |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust funds — Corporate and other non-government debt |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust funds — Government, corporate and other non-government debt |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust funds — Corporate equity |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common/collective trust funds — Customized strategy |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 135.0 | 232.3 |
Significant Other Observable Inputs (Level 2) | Cash |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) | Insurance group annuity contracts |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) | Common/collective trust funds — Government debt |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) | Common/collective trust funds — Corporate and other non-government debt |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 38.4 | 60.6 |
Significant Other Observable Inputs (Level 2) | Common/collective trust funds — Government, corporate and other non-government debt |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 55.3 | 98.7 |
Significant Other Observable Inputs (Level 2) | Common/collective trust funds — Corporate equity |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 41.3 | 67.1 |
Significant Other Observable Inputs (Level 2) | Common/collective trust funds — Customized strategy |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 5.9 |
Unobservable Inputs (Level 3) |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 14.5 | 106.5 |
Unobservable Inputs (Level 3) | Cash |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Unobservable Inputs (Level 3) | Insurance group annuity contracts |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 14.5 | 106.5 | $ 117.7
Unobservable Inputs (Level 3) | Common/collective trust funds — Government debt |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Unobservable Inputs (Level 3) | Common/collective trust funds — Corporate and other non-government debt |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Unobservable Inputs (Level 3) | Common/collective trust funds — Government, corporate and other non-government debt |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Unobservable Inputs (Level 3) | Common/collective trust funds — Corporate equity |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Unobservable Inputs (Level 3) | Common/collective trust funds — Customized strategy |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | $ 0.0 | $ 0.0 |

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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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