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Employee Benefit Plans (Details 5) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Plan assets using fair value hierarchy
Fair value of plan assets	$ 373.7	$ 380.1
Cash
Plan assets using fair value hierarchy
Fair value of plan assets	1.7	2.1
Insurance group annuity contracts
Plan assets using fair value hierarchy
Fair value of plan assets	118.3	111.1
Common/collective trust funds - Government debt
Plan assets using fair value hierarchy
Fair value of plan assets	3.0	8.9
Common/collective trust funds - Corporate and other non-government debt
Plan assets using fair value hierarchy
Fair value of plan assets	49.6	49.8
Common/collective trust funds - Government, corporate and other non-government debt
Plan assets using fair value hierarchy
Fair value of plan assets	111.6	95.5
Common/collective trust funds - Corporate equity
Plan assets using fair value hierarchy
Fair value of plan assets	84.3	71.4
Common/collective trust funds - Customized strategy
Plan assets using fair value hierarchy
Fair value of plan assets	5.2	41.3
Quoted Prices in Active Markets for Identical Assets (Level 1)
Plan assets using fair value hierarchy
Fair value of plan assets	1.7	2.1
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash
Plan assets using fair value hierarchy
Fair value of plan assets	1.7	2.1
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
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
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
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
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
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
Significant Other Observable Inputs (Level 2)
Plan assets using fair value hierarchy
Fair value of plan assets	253.7	266.9
Significant Other Observable Inputs (Level 2) | Cash
Plan assets using fair value hierarchy
Fair value of plan assets	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
Significant Other Observable Inputs (Level 2) | Common/collective trust funds - Government debt
Plan assets using fair value hierarchy
Fair value of plan assets	3.0	8.9
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	49.6	49.8
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	111.6	95.5
Significant Other Observable Inputs (Level 2) | Common/collective trust funds - Corporate equity
Plan assets using fair value hierarchy
Fair value of plan assets	84.3	71.4
Significant Other Observable Inputs (Level 2) | Common/collective trust funds - Customized strategy
Plan assets using fair value hierarchy
Fair value of plan assets	5.2	41.3
Level 3
Plan assets using fair value hierarchy
Fair value of plan assets	118.3	111.1
Level 3 | Cash
Plan assets using fair value hierarchy
Fair value of plan assets	0	0
Level 3 | Insurance group annuity contracts
Plan assets using fair value hierarchy
Fair value of plan assets	118.3	111.1	102.4
Level 3 | Common/collective trust funds - Government debt
Plan assets using fair value hierarchy
Fair value of plan assets	0	0
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
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
Level 3 | Common/collective trust funds - Corporate equity
Plan assets using fair value hierarchy
Fair value of plan assets	0	0
Level 3 | Common/collective trust funds - Customized strategy
Plan assets using fair value hierarchy
Fair value of plan assets	$ 0	$ 0

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- Details

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X

- 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

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