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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income                
Beginning balance $ 1,414.4 $ 1,435.1 $ 1,395.1 $ 1,280.5 $ 1,265.5 $ 1,270.3 $ 1,395.1 $ 1,270.3
Other comprehensive income (loss) before reclassifications (11.8)     (33.3)     (0.2) (62.1)
Amounts reclassified from accumulated other comprehensive income (loss) 0.3     0.2     0.9 0.4
Net current-period other comprehensive loss       (33.1)       (61.7)
Less: other comprehensive income attributable to redeemable non-controlling interests       (1.8)       (3.8)
Net current-period other comprehensive income attributable to EnPro Industries, Inc. (11.5) 5.1 7.1 (31.3) (14.9) (11.7) 0.7 (57.9)
Ending balance 1,407.9 1,414.4 1,435.1 1,267.8 1,280.5 1,265.5 1,407.9 1,267.8
Total                
Accumulated Other Comprehensive Income                
Beginning balance (21.1) (26.2) (33.3) (12.0) 2.9 14.6 (33.3) 14.6
Net current-period other comprehensive income attributable to EnPro Industries, Inc. (11.5) 5.1 7.1 (31.3) (14.9) (11.7)    
Ending balance (32.6) (21.1) (26.2) (43.3) (12.0) 2.9 (32.6) (43.3)
Unrealized Translation Adjustments                
Accumulated Other Comprehensive Income                
Beginning balance 23.4   11.8 19.9   46.7 11.8 46.7
Other comprehensive income (loss) before reclassifications (11.8)     (33.3)     (0.2) (62.1)
Amounts reclassified from accumulated other comprehensive income (loss) 0.0     0.0     0.0 0.0
Net current-period other comprehensive loss       (33.3)       (62.1)
Less: other comprehensive income attributable to redeemable non-controlling interests       (1.8)       (3.8)
Net current-period other comprehensive income attributable to EnPro Industries, Inc. (11.8)     (31.5)     (0.2) (58.3)
Ending balance 11.6 23.4   (11.6) 19.9   11.6 (11.6)
Pension and Other Postretirement Plans                
Accumulated Other Comprehensive Income                
Beginning balance (44.5)   $ (45.1) (31.9)   $ (32.1) (45.1) (32.1)
Other comprehensive income (loss) before reclassifications 0.0     0.0     0.0 0.0
Amounts reclassified from accumulated other comprehensive income (loss) 0.3     0.2     0.9 0.4
Net current-period other comprehensive loss       0.2       0.4
Less: other comprehensive income attributable to redeemable non-controlling interests       0.0       0.0
Net current-period other comprehensive income attributable to EnPro Industries, Inc. 0.3     0.2     0.9 0.4
Ending balance $ (44.2) $ (44.5)   $ (31.7) $ (31.9)   $ (44.2) $ (31.7)