Restructuring - Additional Information (Details) € in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Expense recorded		$ 79.8	$ 36.2	$ 58.5
Accelerated depreciation		$ 10.3	4.3
Impairment of Long-Lived Assets Held-for-use			$ 7.6
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring payment term		12 months
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring payment term		24 months
Plant Closure Axalta Way Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expense recorded	$ 70.6
Plant Closure Axalta Way Restructuring [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Expense recorded		$ 120.0
Accelerated depreciation		50.0
Plant Closure Axalta Way Restructuring [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Expense recorded		130.0
Accelerated depreciation		$ 60.0
Mechelen, Belgium [Member]
Restructuring Cost and Reserve [Line Items]
Disposal Group, Including Discontinued Operation, Assets, Noncurrent					€ 47.7	$ 55.8