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Segment Information - Sales by Product (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total sales	$ 2,001.7	$ 1,077.8	$ 5,831.6	$ 3,245.7
Remanufacturing, Overhaul & Build
Segment Reporting Information [Line Items]
Total sales	985.2	134.7	2,758.4	397.6
Specialty Products & Electronics
Segment Reporting Information [Line Items]
Total sales	461.9	408.8	1,323.3	1,229.8
Transit Products
Segment Reporting Information [Line Items]
Total sales	272.0	258.4	877.6	814.8
Brake Products
Segment Reporting Information [Line Items]
Total sales	239.2	222.2	735.7	655.4
Other
Segment Reporting Information [Line Items]
Total sales	$ 43.4	$ 53.7	$ 136.6	$ 148.1

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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+ References

No definition available.

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