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Employee Benefits (Details 5) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense (credit)for Reliance-sponsored retirement plans | $ 33.1 | $ 30.5 | $ 27.2
Master Plan |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense (credit)for Reliance-sponsored retirement plans | 18.4 | 19.0 | 16.9
Other Defined Contribution Plans |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense (credit)for Reliance-sponsored retirement plans | 7.8 | 4.8 | 3.9
Employee Stock Ownership Plan |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense (credit)for Reliance-sponsored retirement plans | 1.4 | 1.4 | 1.4
Deferred Compensation Plan |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense (credit)for Reliance-sponsored retirement plans | 0.6 | 0.5 | 0.5
Supplemental Executive Retirement Plans |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense (credit)for Reliance-sponsored retirement plans | 3.2 | 2.9 | 2.0
Defined Benefit Plans |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense (credit)for Reliance-sponsored retirement plans | 2.4 | 2.4 | 0.7
Postretirement Medical Plans |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense (credit)for Reliance-sponsored retirement plans | $ (0.7) | $ (0.5) | $ 1.8

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- Definition The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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