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SEGMENT INFORMATION - Segment Financial Information (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
Segment Reporting Information [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
Income (loss) 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 and other, net |  |  |  |  |  |  |  |  | (216.3) | (105.8) | (69.0)
Income (loss) from operations before income taxes |  |  |  |  |  |  |  |  | 446.8 | 367.6 | 352.1
Depreciation and amortization |  |  |  |  |  |  |  |  | 401.4 | 109.3 | 103.2
Capital expenditures |  |  |  |  |  |  |  |  | 185.3 | 93.3 | 89.5
Segment assets | 18,944.2 |  |  |  | 8,649.2 |  |  |  | 18,944.2 | 8,649.2 | 6,580.0
Freight Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 5,441.4 | 1,766.4 | 1,538.6
Transit Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 2,758.6 | 2,597.1 | 2,343.1
Operating Segments | Freight Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 5,501.0 | 1,819.2 | 1,577.6
Income (loss) from operations |  |  |  |  |  |  |  |  | 642.9 | 334.3 | 271.7
Interest expense and other, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income (loss) from operations before income taxes |  |  |  |  |  |  |  |  | 642.9 | 334.3 | 271.7
Depreciation and amortization |  |  |  |  |  |  |  |  | 330.4 | 41.6 | 43.1
Capital expenditures |  |  |  |  |  |  |  |  | 105.1 | 24.6 | 32.2
Segment assets | 14,450.9 |  |  |  | 3,329.6 |  |  |  | 14,450.9 | 3,329.6 | 3,104.9
Operating Segments | Transit Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 2,782.0 | 2,608.4 | 2,348.6
Income (loss) from operations |  |  |  |  |  |  |  |  | 214.4 | 192.5 | 177.2
Interest expense and other, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income (loss) from operations before income taxes |  |  |  |  |  |  |  |  | 214.4 | 192.5 | 177.2
Depreciation and amortization |  |  |  |  |  |  |  |  | 62.2 | 62.7 | 58.0
Capital expenditures |  |  |  |  |  |  |  |  | 63.7 | 61.6 | 52.5
Segment assets | 6,026.0 |  |  |  | 9,478.6 |  |  |  | 6,026.0 | 9,478.6 | 7,885.3
Corporate Activities and Elimination |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | (83.0) | (64.1) | (44.5)
Income (loss) from operations |  |  |  |  |  |  |  |  | (194.2) | (53.4) | (27.8)
Interest expense and other, net |  |  |  |  |  |  |  |  | (216.3) | (105.8) | (69.0)
Income (loss) from operations before income taxes |  |  |  |  |  |  |  |  | (410.5) | (159.2) | (96.8)
Depreciation and amortization |  |  |  |  |  |  |  |  | 8.8 | 5.0 | 2.1
Capital expenditures |  |  |  |  |  |  |  |  | 16.5 | 7.1 | 4.8
Segment assets | $ (1,532.7) |  |  |  | $ (4,159.0) |  |  |  | (1,532.7) | (4,159.0) | (4,410.2)
Corporate Activities and Elimination | Freight Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 59.6 | 52.8 | 39.0
Corporate Activities and Elimination | Transit Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | $ 23.4 | $ 11.3 | $ 5.5

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