Accumulated Other Comprehensive Loss - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Equity [Abstract]
Cumulative income tax benefit on foreign exchange adjustments	$ (0.8)
Cumulative income tax benefit on pension and postretirement benefit plans	(14.3)	$ (24.0)
Cumulative income tax gain (loss) on derivatives	$ 0.0	$ 0.5

Cumulative Other Comprehensive Income Loss, Pension And Other Postretirement Benefit Plans, Income Tax Expense (Benefit)

No definition available.

Name:	axta_CumulativeOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansIncomeTaxExpenseBenefit
Namespace Prefix:	axta_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant