Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net sales	$ 2,068.3	$ 2,050.9	$ 1,851.6
Cost of sales	1,250.3	1,266.1	1,145.1
Gross profit	818.0	784.8	706.5
Selling, general and administrative expenses	432.8	433.1	393.8
Restructuring and other similar charges	15.5	12.1	14.1
Amortization of intangible assets	35.4	34.0	32.2
Income from operations	334.3	305.6	266.4
Non-operating (expense) income:
Interest expense, net	(58.6)	(69.9)	(75.1)
Gain (loss) on the extinguishment of debt	1.0	4.3	(11.9)
Actuarial (loss) gain on pension and postretirement benefit obligations	(36.6)	0.4	3.3
Other (expense) income, net	(3.8)	(1.6)	4.4
Income from continuing operations before income taxes	236.3	238.8	187.1
(Provision) benefit for income taxes	(54.1)	(53.4)	19.5
Equity method investment income	0.0	3.6	0.0
Net income from continuing operations	182.2	189.0	206.6
Loss from discontinued operations, net of tax	(1.8)	(154.7)	(130.6)
Net income	180.4	34.3	76.0
Non-controlling interest income	0.3	0.0	0.1
Net income attributable to Rexnord	180.1	34.3	75.9
Dividends on preferred stock	(14.4)	(23.2)	(23.2)
Net income attributable to Rexnord common stockholders	$ 165.7	$ 11.1	$ 52.7
Basic net income (loss) per share attributable to Rexnord common stockholders:
Continuing operations (in dollars per share)	$ 1.50	$ 1.58	$ 1.76
Discontinued operations (in dollars per share)	(0.02)	(1.48)	(1.26)
Net income (in dollars per share)	1.48	0.11	0.51
Diluted net income (loss) per share attributable to Rexnord common stockholders:
Continuing operations (in dollars per share)	1.46	1.53	1.69
Discontinued operations (in dollars per share)	(0.01)	(1.25)	(1.07)
Net income (in dollars per share)	$ 1.45	$ 0.28	$ 0.62
Weighted-average number of common shares outstanding (in thousands):
Basic (in shares)	111,689	104,640	103,889
Effect of dilutive equity options (in shares)	12,574	18,689	18,095
Diluted (in shares)	124,263	123,329	121,984