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Cash Surrender Value of Life Insurance Policies, net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Information about cash surrender value of life insurance policies
Cash surrender value of all life insurance policies, net of loans and related accrued interest	$ 45.4	$ 45.2
Borrowings available	0
Borrowed portion
Information about cash surrender value of life insurance policies
Paid premiums, principals and accrued interest on loans against policies	46.8	44.2
Amount of borrowed funds used to pay premiums and accrued interest owed	36.5	33.0
Earle M. Jorgensen Company ("EMJ") | Borrowed portion
Information about cash surrender value of life insurance policies
Interest on borrowings against cash surrender value of certain life insurance policies (as a percent)		11.76%
Minimum rate at which the portion of the policy cash surrender value earns interest and dividend income (as a percent)		11.26%
Loans and accrued interest outstanding on EMJ's life insurance policies	$ 447.8	$ 412.7
Earle M. Jorgensen Company ("EMJ") | Unborrowed portion
Information about cash surrender value of life insurance policies
Minimum rate at which the portion of the policy cash surrender value earns interest and dividend income (as a percent)		4.00%

X

- Details

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X

- Definition

Represents the amount of loan borrowing capacity available against life insurance policies.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Represents the gross amount of loans borrowed by the entity against cash surrender value of certain life insurance policies to pay premiums and accrued interest owed.

+ References

No definition available.

+ Details

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- Definition

Represents the fixed interest rate on borrowings against the cash surrender value of certain life insurance policies.

+ References

No definition available.

+ Details

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X

- Definition

Represents the amount of loans and accrued interest outstanding on life insurance policies.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Represents the premiums principal and accrued interest on loans outstanding against life insurance policies.

+ References

No definition available.

+ Details

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Namespace Prefix:	rs_
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X

- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 4

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765

+ Details

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X

- Definition

Guaranteed minimum interest crediting rate applied to cash values for life insurance contracts which are purchased by corporate entities for purposes such as funding the cost of providing employee benefits and protecting against the loss of "key persons." where investment income is accumulated tax free through the internal build-up of the cash surrender value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Subparagraph b

-Article 7



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.13(b))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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