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Segment Information - Sales by Product (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
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
Equipment | Freight Segment
Segment Reporting Information [Line Items]
Total sales	355.3	263.2	1,098.2	1,061.7
Components | Freight Segment
Segment Reporting Information [Line Items]
Total sales	208.2	248.7	624.1	823.4
Digital Electronics | Freight Segment
Segment Reporting Information [Line Items]
Total sales	161.0	185.5	500.1	466.3
Services
Segment Reporting Information [Line Items]
Total sales	321.5	396.3	991.9	899.2
Services | Freight Segment
Segment Reporting Information [Line Items]
Total sales	512.8	635.1	1,520.6	1,422.9
Original Equipment Manufacturer | Transit Segment
Segment Reporting Information [Line Items]
Total sales	303.1	309.9	817.4	972.8
Aftermarket | Transit Segment
Segment Reporting Information [Line Items]
Total sales	$ 324.7	$ 359.3	$ 972.0	$ 1,084.5

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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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