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Segment Information - Segment Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Total sales	$ 1,830.2	$ 1,929.9
Income (loss) from operations	191.6	217.3
Interest expense and other, net	(33.4)	(68.1)
Income (loss) before income taxes	158.2	149.2
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,183.3	1,301.0
Transit Segment
Segment Reporting Information [Line Items]
Total sales	646.9	628.9
Operating Segments | Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,195.7	1,313.5
Income (loss) from operations	141.8	161.7
Interest expense and other, net	0.0	0.0
Income (loss) before income taxes	141.8	161.7
Operating Segments | Transit Segment
Segment Reporting Information [Line Items]
Total sales	656.6	638.0
Income (loss) from operations	70.1	68.6
Interest expense and other, net	0.0	0.0
Income (loss) before income taxes	70.1	68.6
Corporate Activities and Elimination
Segment Reporting Information [Line Items]
Total sales	(22.1)	(21.6)
Income (loss) from operations	(20.3)	(13.0)
Interest expense and other, net	(33.4)	(68.1)
Income (loss) before income taxes	(53.7)	(81.1)
Corporate Activities and Elimination | Freight Segment
Segment Reporting Information [Line Items]
Total sales	12.4	12.5
Corporate Activities and Elimination | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 9.7	$ 9.1

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