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Condensed Consolidating Financial Statements - Statement of Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Unaudited Consolidating Statement of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 2,026.2 | $ 2,286.2 | $ 2,423.7 | $ 2,614.4 | $ 2,576.7 | $ 2,705.1 | $ 2,616.8 | $ 2,553.0 | $ 9,350.5 | $ 10,451.6 | $ 9,223.8
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Cost of sales (exclusive of depreciation and amortization shown below) | 1,444.2 | 1,647.9 | 1,767.8 | 1,943.7 | 1,954.4 | 2,026.9 | 1,943.5 | 1,905.8 | 6,803.6 | 7,830.6 | 6,826.2
Warehouse, delivery, selling, general and administrative |  |  |  |  |  |  |  |  | 1,728.5 | 1,789.8 | 1,638.4
Depreciation and amortization |  |  |  |  |  |  |  |  | 218.5 | 213.8 | 192.4
Impairment of long-lived assets |  |  |  |  |  |  |  |  | 53.3 |  | 14.9
Total costs and expenses |  |  |  |  |  |  |  |  | 8,803.9 | 9,834.2 | 8,671.9
Operating (loss) income |  |  |  |  |  |  |  |  | 546.6 | 617.4 | 551.9
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | (84.3) | (81.9) | (77.5)
Other (expense) income, net |  |  |  |  |  |  |  |  | (3.6) | 10.8 | 3.9
(Loss) income before equity in earnings of subsidiaries and income taxes |  |  |  |  |  |  |  |  | 458.7 | 546.3 | 478.3
Income before income taxes |  |  |  |  |  |  |  |  | 458.7 | 546.3 | 478.3
Income tax (benefit) provision |  |  |  |  |  |  |  |  | 142.5 | 170.0 | 153.6
Net income | 68.9 | 52.8 | 91.6 | 102.9 | 93.7 | 96.9 | 97.8 | 87.9 | 316.2 | 376.3 | 324.7
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 4.7 | 4.8 | 3.1
Net income attributable to Reliance | $ 68.6 | $ 51.4 | $ 90.2 | $ 101.3 | $ 92.3 | $ 95.5 | $ 96.5 | $ 87.2 | 311.5 | 371.5 | 321.6
Comprehensive income attributable to Reliance |  |  |  |  |  |  |  |  | 260.7 | 329.3 | 316.4
Reportable legal entities | Parent |  |  |  |  |  |  |  |  |  |  |
Condensed Unaudited Consolidating Statement of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 710.9 | 750.2 | 704.5
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Cost of sales (exclusive of depreciation and amortization shown below) |  |  |  |  |  |  |  |  | 503.1 | 557.0 | 509.7
Warehouse, delivery, selling, general and administrative |  |  |  |  |  |  |  |  | 168.1 | 157.3 | 200.7
Depreciation and amortization |  |  |  |  |  |  |  |  | 16.8 | 19.8 | 17.5
Total costs and expenses |  |  |  |  |  |  |  |  | 688.0 | 734.1 | 727.9
Operating (loss) income |  |  |  |  |  |  |  |  | 22.9 | 16.1 | (23.4)
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | (80.3) | (78.1) | (74.7)
Other (expense) income, net |  |  |  |  |  |  |  |  | 17.2 | 67.7 | 75.7
(Loss) income before equity in earnings of subsidiaries and income taxes |  |  |  |  |  |  |  |  | (40.2) | 5.7 | (22.4)
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 297.8 | 325.1 | 300.3
Income before income taxes |  |  |  |  |  |  |  |  | 257.6 | 330.8 | 277.9
Income tax (benefit) provision |  |  |  |  |  |  |  |  | (53.9) | (40.7) | (43.7)
Net income |  |  |  |  |  |  |  |  | 311.5 | 371.5 | 321.6
Net income attributable to Reliance |  |  |  |  |  |  |  |  | 311.5 | 371.5 | 321.6
Comprehensive income attributable to Reliance |  |  |  |  |  |  |  |  | 260.7 | 367.5 | 318.9
Reportable legal entities | Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Unaudited Consolidating Statement of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,978.3 | 9,110.2 | 8,021.6
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Cost of sales (exclusive of depreciation and amortization shown below) |  |  |  |  |  |  |  |  | 5,833.9 | 6,885.4 | 5,999.2
Warehouse, delivery, selling, general and administrative |  |  |  |  |  |  |  |  | 1,435.8 | 1,545.9 | 1,385.5
Depreciation and amortization |  |  |  |  |  |  |  |  | 179.1 | 174.0 | 158.6
Impairment of long-lived assets |  |  |  |  |  |  |  |  | 51.8 |  | 14.9
Total costs and expenses |  |  |  |  |  |  |  |  | 7,500.6 | 8,605.3 | 7,558.2
Operating (loss) income |  |  |  |  |  |  |  |  | 477.7 | 504.9 | 463.4
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | (19.2) | (28.3) | (19.9)
Other (expense) income, net |  |  |  |  |  |  |  |  | (0.7) | (2.7) | 5.5
(Loss) income before equity in earnings of subsidiaries and income taxes |  |  |  |  |  |  |  |  | 457.8 | 473.9 | 449.0
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 13.1 | 21.2 | 12.4
Income before income taxes |  |  |  |  |  |  |  |  | 470.9 | 495.1 | 461.4
Income tax (benefit) provision |  |  |  |  |  |  |  |  | 182.5 | 190.1 | 181.0
Net income |  |  |  |  |  |  |  |  | 288.4 | 305.0 | 280.4
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 4.7 | 4.4 | 2.8
Net income attributable to Reliance |  |  |  |  |  |  |  |  | 283.7 | 300.6 | 277.6
Comprehensive income attributable to Reliance |  |  |  |  |  |  |  |  | 250.1 | 280.4 | 293.5
Reportable legal entities | Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Unaudited Consolidating Statement of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 864.6 | 825.9 | 710.1
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Cost of sales (exclusive of depreciation and amortization shown below) |  |  |  |  |  |  |  |  | 670.0 | 623.0 | 529.7
Warehouse, delivery, selling, general and administrative |  |  |  |  |  |  |  |  | 140.0 | 140.9 | 117.8
Depreciation and amortization |  |  |  |  |  |  |  |  | 22.6 | 20.0 | 16.3
Impairment of long-lived assets |  |  |  |  |  |  |  |  | 1.5 |  |
Total costs and expenses |  |  |  |  |  |  |  |  | 834.1 | 783.9 | 663.8
Operating (loss) income |  |  |  |  |  |  |  |  | 30.5 | 42.0 | 46.3
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | (6.7) | (5.7) | (4.2)
Other (expense) income, net |  |  |  |  |  |  |  |  | 17.3 | 30.4 | 9.6
(Loss) income before equity in earnings of subsidiaries and income taxes |  |  |  |  |  |  |  |  | 41.1 | 66.7 | 51.7
Income before income taxes |  |  |  |  |  |  |  |  | 41.1 | 66.7 | 51.7
Income tax (benefit) provision |  |  |  |  |  |  |  |  | 13.9 | 20.6 | 16.3
Net income |  |  |  |  |  |  |  |  | 27.2 | 46.1 | 35.4
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0.4 | 0.3
Net income attributable to Reliance |  |  |  |  |  |  |  |  | 27.2 | 45.7 | 35.1
Comprehensive income attributable to Reliance |  |  |  |  |  |  |  |  | (18.9) | 27.7 | 16.7
Consolidating Adjustments |  |  |  |  |  |  |  |  |  |  |
Condensed Unaudited Consolidating Statement of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (203.3) | (234.7) | (212.4)
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Cost of sales (exclusive of depreciation and amortization shown below) |  |  |  |  |  |  |  |  | (203.4) | (234.8) | (212.4)
Warehouse, delivery, selling, general and administrative |  |  |  |  |  |  |  |  | (15.4) | (54.3) | (65.6)
Total costs and expenses |  |  |  |  |  |  |  |  | (218.8) | (289.1) | (278.0)
Operating (loss) income |  |  |  |  |  |  |  |  | 15.5 | 54.4 | 65.6
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 21.9 | 30.2 | 21.3
Other (expense) income, net |  |  |  |  |  |  |  |  | (37.4) | (84.6) | (86.9)
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | (310.9) | (346.3) | (312.7)
Income before income taxes |  |  |  |  |  |  |  |  | (310.9) | (346.3) | (312.7)
Net income |  |  |  |  |  |  |  |  | (310.9) | (346.3) | (312.7)
Net income attributable to Reliance |  |  |  |  |  |  |  |  | (310.9) | (346.3) | (312.7)
Comprehensive income attributable to Reliance |  |  |  |  |  |  |  |  | $ (231.2) | $ (346.3) | $ (312.7)

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