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Segment Information - Sales by Product (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Total sales	$ 1,906.9	$ 1,865.1	$ 5,749.4	$ 5,532.4
Freight Segment
Segment Reporting Information [Line Items]
Total sales	1,295.0	1,237.3	3,814.2	3,743.0
Transit Segment
Segment Reporting Information [Line Items]
Total sales	611.9	627.8	1,935.2	1,789.4
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	335.2	355.3	924.8	1,098.2
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	222.1	208.2	648.9	624.1
Digital Electronics | Freight Segment
Segment Reporting Information [Line Items]
Total sales	155.2	161.0	473.5	500.1
Services
Segment Reporting Information [Line Items]
Total sales	417.8	321.5	1,187.2	991.9
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	582.5	512.8	1,767.0	1,520.6
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	286.9	303.1	894.1	817.4
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 325.0	$ 324.7	$ 1,041.1	$ 972.0

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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