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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

X

- 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.

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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

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