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Retirement Plans (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Retirement Plans
Fair value of plan assets	$ 162.7	$ 177.3
Cash
Retirement Plans
Fair value of plan assets	0.6	0.6
Equity mutual funds
Retirement Plans
Fair value of plan assets	$ 19.8	21.4
Target allocation percentage of investments	12.00%
Fixed income mutual funds
Retirement Plans
Fair value of plan assets	$ 142.3	155.3
Target allocation percentage of investments	88.00%
Quoted Prices in Active Markets for Identical Assets (Level 1)
Retirement Plans
Fair value of plan assets	$ 162.7	177.3
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash
Retirement Plans
Fair value of plan assets	0.6	0.6
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity mutual funds
Retirement Plans
Fair value of plan assets	19.8	21.4
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income mutual funds
Retirement Plans
Fair value of plan assets	$ 142.3	$ 155.3

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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=29635418&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=35743120&loc=d3e1928-114920

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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