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Employee Benefit Plans - Schedule of plan assets using the fair value hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | $ 340.8 | $ 374.0 |
Cash |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 2.0 | 1.7 |
Insurance group annuity contracts |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 106.5 | 117.7 |
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 | 60.6 | 47.5 |
Common/collective trust funds — Government, corporate and other non-government debt |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 98.7 | 109.9 |
Common/collective trust funds — Corporate equity |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 67.1 | 92.9 |
Common/collective trust funds — Customized strategy |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 5.9 | 4.3 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 2.0 | 1.7 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 2.0 | 1.7 |
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 | 232.3 | 254.6 |
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 | 60.6 | 47.5 |
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 | 98.7 | 109.9 |
Significant Other Observable Inputs (Level 2) | Common/collective trust funds — Corporate equity |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 67.1 | 92.9 |
Significant Other Observable Inputs (Level 2) | Common/collective trust funds — Customized strategy |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 5.9 | 4.3 |
Unobservable Inputs (Level 3) |  |  |
Plan assets using fair value hierarchy |  |  |
Fair value of plan assets | 106.5 | 117.7 |
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 | 106.5 | 117.7 | $ 118.3
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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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