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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Loss by Components (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income      
Beginning balance $ 1,078.5    
Other comprehensive income before reclassifications 6.3 $ 27.5 $ 15.3
Amounts reclassified from accumulated other comprehensive loss 13.6 7.0 5.3
Other comprehensive income, net of tax 19.9 34.5 20.6
Less: other comprehensive income attributable to non-controlling interests 0.4 3.0 0.0
Other comprehensive income, net of tax attributable to EnPro Industries, Inc 19.5 31.5 20.6
Ending balance 1,266.6 1,078.5  
Total      
Accumulated Other Comprehensive Income      
Beginning balance (4.9) (36.4) (45.5)
Other comprehensive income, net of tax 19.5 31.5 20.6
Ending balance 14.6 (4.9) (36.4)
Total | Adjustment      
Accumulated Other Comprehensive Income      
Beginning balance     (11.5)
Total | Adjusted balance      
Accumulated Other Comprehensive Income      
Beginning balance     (57.0)
Unrealized Translation Adjustments      
Accumulated Other Comprehensive Income      
Beginning balance 31.7 9.8 (10.6)
Other comprehensive income before reclassifications 2.5 21.5 20.4
Amounts reclassified from accumulated other comprehensive loss 12.9 3.4 0.0
Other comprehensive income, net of tax 15.4 24.9  
Less: other comprehensive income attributable to non-controlling interests 0.4 3.0  
Other comprehensive income, net of tax attributable to EnPro Industries, Inc 15.0 21.9 20.4
Ending balance 46.7 31.7 9.8
Unrealized Translation Adjustments | Adjustment      
Accumulated Other Comprehensive Income      
Beginning balance     0.0
Unrealized Translation Adjustments | Adjusted balance      
Accumulated Other Comprehensive Income      
Beginning balance     (10.6)
Pension and Other Postretirement Plans      
Accumulated Other Comprehensive Income      
Beginning balance (36.6) (46.2) (34.9)
Other comprehensive income before reclassifications 3.8 6.0 (5.1)
Amounts reclassified from accumulated other comprehensive loss 0.7 3.6 5.3
Other comprehensive income, net of tax 4.5 9.6  
Less: other comprehensive income attributable to non-controlling interests 0.0 0.0  
Other comprehensive income, net of tax attributable to EnPro Industries, Inc 4.5 9.6 0.2
Ending balance $ (32.1) $ (36.6) (46.2)
Pension and Other Postretirement Plans | Adjustment      
Accumulated Other Comprehensive Income      
Beginning balance     (11.5)
Pension and Other Postretirement Plans | Adjusted balance      
Accumulated Other Comprehensive Income      
Beginning balance     $ (46.4)