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Segment Information - Segment Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total sales	$ 1,865.1	$ 2,001.7	$ 5,532.4	$ 5,831.6
Income (loss) from operations	206.7	169.1	583.4	437.0
Interest expense and other, net	(31.3)	(55.8)	(144.5)	(164.9)
Income (loss) from operations before income taxes	175.4	113.3	438.9	272.1
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,237.3	1,332.5	3,743.0	3,774.3
Transit Segment
Segment Reporting Information [Line Items]
Total sales	627.8	669.2	1,789.4	2,057.3
Operating Segments | Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,248.2	1,345.2	3,779.3	3,818.3
Income (loss) from operations	160.2	155.3	463.4	403.7
Interest expense and other, net	0.0	0.0	0.0	0.0
Income (loss) from operations before income taxes	160.2	155.3	463.4	403.7
Operating Segments | Transit Segment
Segment Reporting Information [Line Items]
Total sales	635.6	675.5	1,812.4	2,071.7
Income (loss) from operations	64.1	52.9	172.9	175.4
Interest expense and other, net	0.0	0.0	0.0	0.0
Income (loss) from operations before income taxes	64.1	52.9	172.9	175.4
Corporate Activities and Elimination
Segment Reporting Information [Line Items]
Total sales	(18.7)	(19.0)	(59.3)	(58.4)
Income (loss) from operations	(17.6)	(39.1)	(52.9)	(142.1)
Interest expense and other, net	(31.3)	(55.8)	(144.5)	(164.9)
Income (loss) from operations before income taxes	(48.9)	(94.9)	(197.4)	(307.0)
Corporate Activities and Elimination | Freight Segment
Segment Reporting Information [Line Items]
Total sales	10.9	12.7	36.3	44.0
Corporate Activities and Elimination | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 7.8	$ 6.3	$ 23.0	$ 14.4

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