Summary of Significant Accounting Policies (Details 4) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Equities
Fair Value Measurements
Pension plan assets at fair value	$ 92.4	$ 99.2
Fixed Income Securities
Fair Value Measurements
Pension plan assets at fair value	185.8	188.1
Hedge funds
Fair Value Measurements
Pension plan assets at fair value	23.2
Level 1 \| Cash and equivalents
Fair Value Measurements
Pension plan assets at fair value	6.9	1.0
Fair Value
Fair Value Measurements
Pension plan assets at fair value	308.3	288.3
Fair Value \| Cash and equivalents
Fair Value Measurements
Pension plan assets at fair value	6.9	1.0
Fair Value \| Investments funds
Fair Value Measurements
Pension plan assets at fair value	$ 301.4	$ 287.3

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.

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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Balance Type:	debit
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