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GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION - Income Statement (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales | $ 2,368.4 | $ 2,001.7 | $ 2,236.3 | $ 1,593.6 | $ 1,117.8 | $ 1,077.8 | $ 1,111.7 | $ 1,056.2 | $ 8,200.0 | $ 4,363.5 | $ 3,881.7
Cost of sales |  |  |  |  |  |  |  |  | (5,922.0) | (3,129.6) | (2,816.4)
Gross profit | 674.9 | 599.4 | 614.7 | 389.0 | 297.0 | 302.0 | 324.0 | 310.9 | 2,278.0 | 1,233.9 | 1,065.3
Total operating expenses |  |  |  |  |  |  |  |  | (1,614.9) | (760.5) | (644.2)
Income from operations | 226.1 | 169.1 | 200.6 | 67.3 | 93.4 | 125.2 | 123.5 | 131.3 | 663.1 | 473.4 | 421.1
Interest expense, net |  |  |  |  |  |  |  |  | (219.1) | (112.2) | (77.9)
Other income, net |  |  |  |  |  |  |  |  | 2.8 | 6.4 | 8.9
Equity earnings (loss) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income from operations before income taxes |  |  |  |  |  |  |  |  | 446.8 | 367.6 | 352.1
Income tax expense |  |  |  |  |  |  |  |  | (120.3) | (75.9) | (89.8)
Net income |  |  |  |  |  |  |  |  | 326.5 | 291.7 | 262.3
Less: Net loss attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0.2 | 3.2 | 0.0
Net income attributable to Wabtec shareholders | $ 135.7 | $ 91.1 | $ 104.1 | $ (4.2) | $ 34.4 | $ 87.7 | $ 84.4 | $ 88.4 | 326.7 | 294.9 | 262.3
Comprehensive income (loss) attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 200.7 | 83.3 | 596.9
Elimination |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | (1,535.0) | (232.8) | (129.3)
Cost of sales |  |  |  |  |  |  |  |  | 1,198.7 | 132.3 | 98.7
Gross profit |  |  |  |  |  |  |  |  | (336.3) | (100.5) | (30.6)
Total operating expenses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income from operations |  |  |  |  |  |  |  |  | (336.3) | (100.5) | (30.6)
Interest expense, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other income, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Equity earnings (loss) |  |  |  |  |  |  |  |  | (1,422.9) | (766.3) | (733.7)
Income from operations before income taxes |  |  |  |  |  |  |  |  | (1,759.2) | (866.8) | (764.3)
Income tax expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income |  |  |  |  |  |  |  |  | (1,759.2) | (866.8) | (764.3)
Less: Net loss attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | (1,759.2) | (866.8) | (764.3)
Comprehensive income (loss) attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | (1,759.2) | (866.8) | (764.3)
Parent | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 723.4 | 671.0 | 577.4
Cost of sales |  |  |  |  |  |  |  |  | (562.1) | (495.1) | (440.9)
Gross profit |  |  |  |  |  |  |  |  | 161.3 | 175.9 | 136.5
Total operating expenses |  |  |  |  |  |  |  |  | (321.6) | (173.0) | (114.2)
Income from operations |  |  |  |  |  |  |  |  | (160.3) | 2.9 | 22.3
Interest expense, net |  |  |  |  |  |  |  |  | (214.8) | (110.8) | (76.8)
Other income, net |  |  |  |  |  |  |  |  | (131.5) | 13.5 | 10.0
Equity earnings (loss) |  |  |  |  |  |  |  |  | 809.5 | 396.9 | 416.1
Income from operations before income taxes |  |  |  |  |  |  |  |  | 302.9 | 302.5 | 371.6
Income tax expense |  |  |  |  |  |  |  |  | 23.8 | (7.6) | (109.3)
Net income |  |  |  |  |  |  |  |  | 326.7 | 294.9 | 262.3
Less: Net loss attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 326.7 | 294.9 | 262.3
Comprehensive income (loss) attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 326.7 | 295.8 | 263.9
Guarantors | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 3,245.3 | 483.1 | 398.2
Cost of sales |  |  |  |  |  |  |  |  | (2,429.2) | (304.3) | (255.8)
Gross profit |  |  |  |  |  |  |  |  | 816.1 | 178.8 | 142.4
Total operating expenses |  |  |  |  |  |  |  |  | (311.5) | (57.3) | (50.9)
Income from operations |  |  |  |  |  |  |  |  | 504.6 | 121.5 | 91.5
Interest expense, net |  |  |  |  |  |  |  |  | 12.5 | 12.8 | 10.9
Other income, net |  |  |  |  |  |  |  |  | (11.1) | 0.0 | 0.3
Equity earnings (loss) |  |  |  |  |  |  |  |  | 613.4 | 369.4 | 317.6
Income from operations before income taxes |  |  |  |  |  |  |  |  | 1,119.4 | 503.7 | 420.3
Income tax expense |  |  |  |  |  |  |  |  | (97.0) | (3.3) | 18.8
Net income |  |  |  |  |  |  |  |  | 1,022.4 | 500.4 | 439.1
Less: Net loss attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 1,022.4 | 500.4 | 439.1
Comprehensive income (loss) attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 1,022.4 | 500.4 | 439.1
Non-Guarantors | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 5,766.3 | 3,442.2 | 3,035.4
Cost of sales |  |  |  |  |  |  |  |  | (4,129.4) | (2,462.5) | (2,218.4)
Gross profit |  |  |  |  |  |  |  |  | 1,636.9 | 979.7 | 817.0
Total operating expenses |  |  |  |  |  |  |  |  | (981.8) | (530.2) | (479.1)
Income from operations |  |  |  |  |  |  |  |  | 655.1 | 449.5 | 337.9
Interest expense, net |  |  |  |  |  |  |  |  | (16.8) | (14.2) | (12.0)
Other income, net |  |  |  |  |  |  |  |  | 145.4 | (7.1) | (1.4)
Equity earnings (loss) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income from operations before income taxes |  |  |  |  |  |  |  |  | 783.7 | 428.2 | 324.5
Income tax expense |  |  |  |  |  |  |  |  | (47.1) | (65.0) | 0.7
Net income |  |  |  |  |  |  |  |  | 736.6 | 363.2 | 325.2
Less: Net loss attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0.2 | 3.2 | 0.0
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 736.8 | 366.4 | 325.2
Comprehensive income (loss) attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | $ 610.8 | $ 153.9 | $ 658.2

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