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Equity (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 29, 2012 | Feb. 28, 2011 | Dec. 31, 2011 vote | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 series vote | Dec. 31, 2010 | Dec. 31, 2009 | May 31, 2005
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized common stock |  |  | 100,000,000 |  |  |  | 100,000,000 |  |  |  | 100,000,000 | 100,000,000 |  |
Common stock quarterly dividend per share, after increase (in dollars per share) | $ 0.15 | $ 0.12 |  |  |  |  |  |  |  |  | $ 0.48 | $ 0.40 | $ 0.40 |
Common stock quarterly dividend per share, before increase (in dollars per share) | $ 0.12 | $ 0.10 |  |  |  |  |  |  |  |  |  |  |  |
Votes per share of common stock |  |  | 1 |  |  |  |  |  |  |  | 1 |  |  |
Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized by the Board of Directors to be repurchased under stock repurchase program |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000
Remaining number of common stock authorized for repurchase under stock repurchase program (in shares) |  |  | 7,883,033 |  |  |  |  |  |  |  | 7,883,033 |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized preferred stock |  |  | 5,000,000 |  |  |  | 5,000,000 |  |  |  | 5,000,000 | 5,000,000 |  |
Minimum number of series in which preferred shares may be issued |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Other Comprehensive (Loss) Income |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  | $ 69,100,000 | $ 86,300,000 | $ 100,200,000 | $ 93,600,000 | $ 40,800,000 | $ 49,300,000 | $ 62,800,000 | $ 45,000,000 | $ 349,200,000 | $ 197,900,000 | $ 149,200,000 |
Other comprehensive (loss) income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation gain (loss) |  |  |  |  |  |  |  |  |  |  | (9,900,000) | 9,700,000 | 25,900,000 |
Unrealized (loss) gain on investments, net of tax |  |  |  |  |  |  |  |  |  |  | (200,000) | 200,000 | 500,000 |
Minimum pension liability, net of tax |  |  |  |  |  |  |  |  |  |  | (9,000,000) | 1,900,000 | 4,100,000 |
Total other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  | (19,100,000) | 11,800,000 | 30,500,000 |
Comprehensive income |  |  |  |  |  |  |  |  |  |  | 330,100,000 | 209,700,000 | 179,700,000 |
Less: comprehensive income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | (5,400,000) | (3,500,000) | (1,000,000) |
Comprehensive income attributable to Reliance |  |  |  |  |  |  |  |  |  |  | 324,700,000 | 206,200,000 | 178,700,000 |
Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation gain |  |  | 10,400,000 |  |  |  | 20,300,000 |  |  |  | 10,400,000 | 20,300,000 |  |
Unrealized loss on investments, net of tax |  |  | (400,000) |  |  |  | (200,000) |  |  |  | (400,000) | (200,000) |  |
Minimum pension liability, net of tax |  |  | (18,800,000) |  |  |  | (9,800,000) |  |  |  | (18,800,000) | (9,800,000) |  |
Total accumulated other comprehensive (loss) income |  |  | (8,800,000) |  |  |  | 10,300,000 |  |  |  | (8,800,000) | 10,300,000 |  |
Deferred tax assets in accumulated other comprehensive income, unrealized loss on investments |  |  | 100,000 |  |  |  | 100,000 |  |  |  | 100,000 | 100,000 |  |
Deferred tax assets in accumulated other comprehensive income, pension liabilities |  |  | $ 11,500,000 |  |  |  | $ 6,600,000 |  |  |  | $ 11,500,000 | $ 6,600,000 |  |

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