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Segment Information - Sales by Product (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
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
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	261.8	408.0
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	202.5	220.4
Digital Electronics | Freight Segment
Segment Reporting Information [Line Items]
Total sales	156.5	173.6
Services
Segment Reporting Information [Line Items]
Total sales	345.1	339.1
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	562.5	499.0
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	286.8	287.0
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 360.1	$ 341.9

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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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