Guarantor Subsidiaries - Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 |
Condensed Income Statements, Captions [Line Items] | | | | | | | | |
Net sales | $ 485 | | $ 436.7 | | | | $ 1,513.4 | $ 1,333.7 |
Cost of sales | 300.7 | | 266.6 | | | | 930.4 | 825.9 |
Gross profit | 184.3 | | 170.1 | | | | 583 | 507.8 |
Selling, general and administrative expenses | 102.4 | | 94.3 | | | | 323.8 | 286 |
Restructuring and other similar charges | 2.6 | | 3.2 | | | | 9.4 | 8.3 |
Amortization of intangible assets | 8.4 | | 8.2 | | | | 25.4 | 23.8 |
Income from operations | 70.9 | | 64.4 | | | | 224.4 | 189.7 |
Interest income (expense), net: | | | | | | | | |
To third parties | (16.8) | | (18.5) | | | | (54.1) | (58.5) |
To affiliates | 0 | | 0 | | | | 0 | 0 |
Gain (loss) on the extinguishment of debt | 5 | | (11.9) | | | | 5 | (11.9) |
Other income (expense), net | 1.6 | | 0.9 | | | | 3.3 | 2.8 |
Income (loss) before income taxes | 60.7 | | 34.9 | | | | 178.6 | 122.1 |
Benefit (provision) for income taxes | (9.1) | $ (9.1) | 51 | $ 51 | $ (40.8) | $ 26.5 | (40.8) | 26.5 |
Equity method investment income | 1.3 | | 0 | | | | 3.5 | 0 |
Income (loss) before equity in (loss) income of subsidiaries | 52.9 | | 85.9 | | | | 141.3 | 148.6 |
Equity in (loss) income of subsidiaries | 0 | | 0 | | | | 0 | 0 |
Net income from continuing operations | 52.9 | | 85.9 | | | | 141.3 | 148.6 |
Loss (income) from discontinued operations | (27.8) | | (4.3) | | | | (154.3) | (10.7) |
Net (loss) income | 25.1 | | 81.6 | | | | (13) | 137.9 |
Non-controlling interest loss | (0.3) | | 0 | | | | (0.1) | 0 |
Net income (loss) attributable to Rexnord | 25.4 | | 81.6 | | | | (12.9) | 137.9 |
Dividends on preferred stock | (5.8) | | (5.8) | | | | (17.4) | (17.4) |
Net income (loss) attributable to Rexnord common stockholders | 19.6 | | 75.8 | | | | (30.3) | 120.5 |
Comprehensive income (loss) | 34.5 | | 89.4 | | | | (36) | 182.1 |
Eliminations | | | | | | | | |
Condensed Income Statements, Captions [Line Items] | | | | | | | | |
Net sales | (43.6) | | (42.6) | | | | (142) | (118.9) |
Cost of sales | (43.6) | | (42.6) | | | | (142) | (118.9) |
Gross profit | 0 | | 0 | | | | 0 | 0 |
Selling, general and administrative expenses | 0 | | 0 | | | | 0 | 0 |
Restructuring and other similar charges | 0 | | 0 | | | | 0 | 0 |
Amortization of intangible assets | 0 | | 0 | | | | 0 | 0 |
Income from operations | 0 | | 0 | | | | 0 | 0 |
Interest income (expense), net: | | | | | | | | |
To third parties | 0 | | 0 | | | | 0 | 0 |
To affiliates | 0 | | 0 | | | | 0 | 0 |
Gain (loss) on the extinguishment of debt | 0 | | 0 | | | | 0 | 0 |
Other income (expense), net | 0 | | 0 | | | | 0 | 0 |
Income (loss) before income taxes | 0 | | 0 | | | | 0 | 0 |
Benefit (provision) for income taxes | 0 | | 0 | | | | 0 | 0 |
Equity method investment income | 0 | | | | | | 0 | |
Income (loss) before equity in (loss) income of subsidiaries | 0 | | 0 | | | | 0 | 0 |
Equity in (loss) income of subsidiaries | (90.2) | | (195.8) | | | | 71.7 | (343.3) |
Net income from continuing operations | (90.2) | | (195.8) | | | | 71.7 | (343.3) |
Loss (income) from discontinued operations | 0 | | 0 | | | | 0 | 0 |
Net (loss) income | (90.2) | | | | | | 71.7 | |
Non-controlling interest loss | 0 | | | | | | 0 | |
Net income (loss) attributable to Rexnord | (90.2) | | (195.8) | | | | 71.7 | (343.3) |
Dividends on preferred stock | 0 | | 0 | | | | 0 | 0 |
Net income (loss) attributable to Rexnord common stockholders | (90.2) | | (195.8) | | | | 71.7 | (343.3) |
Comprehensive income (loss) | (90.2) | | (195.8) | | | | 71.7 | (343.3) |
Parent | | | | | | | | |
Condensed Income Statements, Captions [Line Items] | | | | | | | | |
Net sales | 0 | | 0 | | | | 0 | 0 |
Cost of sales | 0 | | 0 | | | | 0 | 0 |
Gross profit | 0 | | 0 | | | | 0 | 0 |
Selling, general and administrative expenses | 0 | | 0 | | | | 0 | 0 |
Restructuring and other similar charges | 0 | | 0 | | | | 0 | 0 |
Amortization of intangible assets | 0 | | 0 | | | | 0 | 0 |
Income from operations | 0 | | 0 | | | | 0 | 0 |
Interest income (expense), net: | | | | | | | | |
To third parties | 0 | | 0 | | | | 0 | 0 |
To affiliates | 0.5 | | 0.7 | | | | 1.6 | 2.4 |
Gain (loss) on the extinguishment of debt | 0 | | 0 | | | | 0 | 0 |
Other income (expense), net | 0 | | 0 | | | | 0 | 0 |
Income (loss) before income taxes | 0.5 | | 0.7 | | | | 1.6 | 2.4 |
Benefit (provision) for income taxes | 0 | | 0 | | | | 0 | 0 |
Equity method investment income | 0 | | | | | | 0 | |
Income (loss) before equity in (loss) income of subsidiaries | 0.5 | | 0.7 | | | | 1.6 | 2.4 |
Equity in (loss) income of subsidiaries | 24.7 | | 80.9 | | | | (14.6) | 135.5 |
Net income from continuing operations | 25.2 | | 81.6 | | | | (13) | 137.9 |
Loss (income) from discontinued operations | 0 | | 0 | | | | 0 | 0 |
Net (loss) income | 25.2 | | | | | | (13) | |
Non-controlling interest loss | 0 | | | | | | 0 | |
Net income (loss) attributable to Rexnord | 25.2 | | 81.6 | | | | (13) | 137.9 |
Dividends on preferred stock | (5.8) | | (5.8) | | | | (17.4) | (17.4) |
Net income (loss) attributable to Rexnord common stockholders | 19.4 | | 75.8 | | | | (30.4) | 120.5 |
Comprehensive income (loss) | 25.1 | | 81.6 | | | | (13) | 137.9 |
Issuers | | | | | | | | |
Condensed Income Statements, Captions [Line Items] | | | | | | | | |
Net sales | 0 | | 0 | | | | 0 | 0 |
Cost of sales | 0 | | 0 | | | | 0 | 0 |
Gross profit | 0 | | 0 | | | | 0 | 0 |
Selling, general and administrative expenses | 0 | | 0 | | | | 0 | 0 |
Restructuring and other similar charges | 0 | | 0 | | | | 0 | 0 |
Amortization of intangible assets | 0 | | 0 | | | | 0 | 0 |
Income from operations | 0 | | 0 | | | | 0 | 0 |
Interest income (expense), net: | | | | | | | | |
To third parties | (16.2) | | (18.7) | | | | (52.8) | (59.3) |
To affiliates | 9 | | 6.7 | | | | 28.6 | 19.8 |
Gain (loss) on the extinguishment of debt | 0 | | (11.9) | | | | 0 | (11.9) |
Other income (expense), net | 0.1 | | (0.1) | | | | 0.2 | 0 |
Income (loss) before income taxes | (7.1) | | (24) | | | | (24) | (51.4) |
Benefit (provision) for income taxes | 0 | | 0 | | | | 0 | 0 |
Equity method investment income | 0 | | | | | | 0 | |
Income (loss) before equity in (loss) income of subsidiaries | (7.1) | | (24) | | | | (24) | (51.4) |
Equity in (loss) income of subsidiaries | 31.8 | | 104.9 | | | | 9.4 | 186.9 |
Net income from continuing operations | 24.7 | | 80.9 | | | | (14.6) | 135.5 |
Loss (income) from discontinued operations | 0 | | 0 | | | | 0 | 0 |
Net (loss) income | 24.7 | | | | | | (14.6) | |
Non-controlling interest loss | 0 | | | | | | 0 | |
Net income (loss) attributable to Rexnord | 24.7 | | 80.9 | | | | (14.6) | 135.5 |
Dividends on preferred stock | 0 | | 0 | | | | 0 | 0 |
Net income (loss) attributable to Rexnord common stockholders | 24.7 | | 80.9 | | | | (14.6) | 135.5 |
Comprehensive income (loss) | 19.5 | | 83.5 | | | | (23.6) | 147.4 |
Guarantor Subsidiaries | | | | | | | | |
Condensed Income Statements, Captions [Line Items] | | | | | | | | |
Net sales | 371.8 | | 347.7 | | | | 1,157.8 | 1,064.3 |
Cost of sales | 236.3 | | 216.2 | | | | 716.1 | 661.9 |
Gross profit | 135.5 | | 131.5 | | | | 441.7 | 402.4 |
Selling, general and administrative expenses | 76.5 | | 75.1 | | | | 244.6 | 227.3 |
Restructuring and other similar charges | 2.1 | | 2.9 | | | | 6.3 | 7.7 |
Amortization of intangible assets | 6.8 | | 6.9 | | | | 20.6 | 19.7 |
Income from operations | 50.1 | | 46.6 | | | | 170.2 | 147.7 |
Interest income (expense), net: | | | | | | | | |
To third parties | (0.8) | | 0.1 | | | | (1.6) | 0.4 |
To affiliates | (7.2) | | (6.2) | | | | (21.4) | (18.2) |
Gain (loss) on the extinguishment of debt | 5 | | 0 | | | | 5 | 0 |
Other income (expense), net | 1.4 | | (0.2) | | | | 3.9 | 0.1 |
Income (loss) before income taxes | 48.5 | | 40.3 | | | | 156.1 | 130 |
Benefit (provision) for income taxes | (9.4) | | 57.4 | | | | (35.4) | 40.6 |
Equity method investment income | 0 | | | | | | 0 | |
Income (loss) before equity in (loss) income of subsidiaries | 39.1 | | 97.7 | | | | 120.7 | 170.6 |
Equity in (loss) income of subsidiaries | 33.7 | | 10 | | | | (66.5) | 20.9 |
Net income from continuing operations | 72.8 | | 107.7 | | | | 54.2 | 191.5 |
Loss (income) from discontinued operations | (41.1) | | (2.7) | | | | (44.8) | (4.6) |
Net (loss) income | 31.7 | | | | | | 9.4 | |
Non-controlling interest loss | 0 | | | | | | 0 | |
Net income (loss) attributable to Rexnord | 31.7 | | 105 | | | | 9.4 | 186.9 |
Dividends on preferred stock | 0 | | 0 | | | | 0 | 0 |
Net income (loss) attributable to Rexnord common stockholders | 31.7 | | 105 | | | | 9.4 | 186.9 |
Comprehensive income (loss) | 29 | | 104.7 | | | | 8.5 | 189.3 |
Non-Guarantor Subsidiaries | | | | | | | | |
Condensed Income Statements, Captions [Line Items] | | | | | | | | |
Net sales | 156.8 | | 131.6 | | | | 497.6 | 388.3 |
Cost of sales | 108 | | 93 | | | | 356.3 | 282.9 |
Gross profit | 48.8 | | 38.6 | | | | 141.3 | 105.4 |
Selling, general and administrative expenses | 25.9 | | 19.2 | | | | 79.2 | 58.7 |
Restructuring and other similar charges | 0.5 | | 0.3 | | | | 3.1 | 0.6 |
Amortization of intangible assets | 1.6 | | 1.3 | | | | 4.8 | 4.1 |
Income from operations | 20.8 | | 17.8 | | | | 54.2 | 42 |
Interest income (expense), net: | | | | | | | | |
To third parties | 0.2 | | 0.1 | | | | 0.3 | 0.4 |
To affiliates | (2.3) | | (1.2) | | | | (8.8) | (4) |
Gain (loss) on the extinguishment of debt | 0 | | 0 | | | | 0 | 0 |
Other income (expense), net | 0.1 | | 1.2 | | | | (0.8) | 2.7 |
Income (loss) before income taxes | 18.8 | | 17.9 | | | | 44.9 | 41.1 |
Benefit (provision) for income taxes | 0.3 | | (6.4) | | | | (5.4) | (14.1) |
Equity method investment income | 1.3 | | | | | | 3.5 | |
Income (loss) before equity in (loss) income of subsidiaries | 20.4 | | 11.5 | | | | 43 | 27 |
Equity in (loss) income of subsidiaries | 0 | | 0 | | | | 0 | 0 |
Net income from continuing operations | 20.4 | | 11.5 | | | | 43 | 27 |
Loss (income) from discontinued operations | 13.3 | | (1.6) | | | | (109.5) | (6.1) |
Net (loss) income | 33.7 | | | | | | (66.5) | |
Non-controlling interest loss | (0.3) | | | | | | (0.1) | |
Net income (loss) attributable to Rexnord | 34 | | 9.9 | | | | (66.4) | 20.9 |
Dividends on preferred stock | 0 | | 0 | | | | 0 | 0 |
Net income (loss) attributable to Rexnord common stockholders | 34 | | 9.9 | | | | (66.4) | 20.9 |
Comprehensive income (loss) | $ 51.1 | | $ 15.4 | | | | $ (79.6) | $ 50.8 |