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Segment Information - Sales by Product (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
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
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	334.9	531.4	742.9	798.5
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	195.5	279.5	415.9	574.7
Digital Electronics | Freight Segment
Segment Reporting Information [Line Items]
Total sales	165.5	159.0	339.1	280.8
Services
Segment Reporting Information [Line Items]
Total sales	331.3	343.8	670.4	502.9
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	508.8	556.4	1,007.8	787.8
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	227.3	335.6	514.3	662.9
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 305.4	$ 374.4	$ 647.3	$ 725.2

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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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