Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 2,050.9	$ 1,851.6	$ 1,712.5
Cost of sales	1,266.1	1,145.1	1,086.1
Gross profit	784.8	706.5	626.4
Selling, general and administrative expenses	433.1	393.8	356.1
Restructuring and other similar charges	12.1	14.1	26.1
Amortization of intangible assets	34.0	32.2	41.0
Income from operations	305.6	266.4	203.2
Non-operating (expense) income:
Interest expense, net	(69.9)	(75.1)	(88.3)
Gain (loss) on the extinguishment of debt	4.3	(11.9)	(7.8)
Other (expense) income, net	(1.2)	7.7	0.2
Income from continuing operations before income taxes	238.8	187.1	107.3
(Provision) benefit for income taxes	(53.4)	19.5	(15.6)
Equity method investment income	3.6	0.0	0.0
Net income from continuing operations	189.0	206.6	91.7
Loss from discontinued operations, net of tax	(154.7)	(130.6)	(17.6)
Net income (loss)	34.3	76.0	74.1
Non-controlling interest income	0.0	0.1	0.0
Net income (loss) attributable to Rexnord	34.3	75.9	74.1
Dividends on preferred stock	(23.2)	(23.2)	(7.3)
Net income (loss) attributable to Rexnord common stockholders	$ 11.1	$ 52.7	$ 66.8
Basic net income (loss) per share attributable to Rexnord common stockholders:
Continuing operations (in dollars per share)	$ 1.58	$ 1.76	$ 0.82
Discontinued operations (in dollars per share)	(1.48)	(1.26)	(0.17)
Net income (in dollars per share)	0.11	0.51	0.65
Diluted net income (loss) per share attributable to Rexnord common stockholders:
Continuing operations (in dollars per share)	1.53	1.69	0.81
Discontinued operations (in dollars per share)	(1.25)	(1.07)	(0.17)
Net income (in dollars per share)	$ 0.28	$ 0.62	$ 0.64
Weighted-average number of common shares outstanding (in thousands):
Basic (in shares)	104,640	103,889	102,753
Effect of dilutive stock options (in shares)	18,689	18,095	2,031
Diluted (in shares)	123,329	121,984	104,784