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Segment Information - Segment Financial Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Total sales $ 1,737.4 $ 2,236.3 $ 3,667.3 $ 3,829.9
Income (loss) from operations 159.4 200.6 376.7 267.9
Interest expense and other, net (45.1) (56.4) (113.2) (109.1)
Income (loss) from operations before income taxes 114.3 144.2 263.5 158.8
Freight Segment        
Segment Reporting Information [Line Items]        
Total sales 1,204.7 1,526.3 2,505.7 2,441.8
Transit Segment        
Segment Reporting Information [Line Items]        
Total sales 532.7 710.0 1,161.6 1,388.1
Operating Segments | Freight Segment        
Segment Reporting Information [Line Items]        
Total sales 1,217.6 1,541.9 2,531.1 2,473.1
Income (loss) from operations 141.5 167.5 303.2 248.4
Interest expense and other, net 0.0 0.0 0.0 0.0
Income (loss) from operations before income taxes 141.5 167.5 303.2 248.4
Operating Segments | Transit Segment        
Segment Reporting Information [Line Items]        
Total sales 538.8 714.0 1,176.8 1,396.2
Income (loss) from operations 40.2 62.6 108.8 122.5
Interest expense and other, net 0.0 0.0 0.0 0.0
Income (loss) from operations before income taxes 40.2 62.6 108.8 122.5
Corporate Activities and Elimination        
Segment Reporting Information [Line Items]        
Total sales (19.0) (19.6) (40.6) (39.4)
Income (loss) from operations (22.3) (29.5) (35.3) (103.0)
Interest expense and other, net (45.1) (56.4) (113.2) (109.1)
Income (loss) from operations before income taxes (67.4) (85.9) (148.5) (212.1)
Corporate Activities and Elimination | Freight Segment        
Segment Reporting Information [Line Items]        
Total sales 12.9 15.6 25.4 31.3
Corporate Activities and Elimination | Transit Segment        
Segment Reporting Information [Line Items]        
Total sales $ 6.1 $ 4.0 $ 15.2 $ 8.1