Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial information
Net sales	$ 1,098.4	$ 1,107.0	$ 1,157.5	$ 1,119.3	$ 1,165.8	$ 1,146.0	$ 1,212.2	$ 1,172.0	$ 4,482.2	$ 4,696.0	$ 4,377.0
Cost of goods sold	710.8	707.4	748.4	751.3	777.4	759.1	793.8	776.0	2,917.9	3,106.3	2,780.5
Operating Income (Loss)	108.7	123.0	157.9	98.6	127.8	47.8	146.5	120.0	488.2	442.1	363.7
Net income (loss)	42.2	66.4	99.9	44.1	76.8	(11.6)	77.1	71.0	252.6	213.3	47.7
Net income (loss) attributable to controlling interests	$ 41.7	$ 65.5	$ 98.4	$ 43.4	$ 75.4	$ (13.1)	$ 74.9	$ 69.9	$ 249.0	$ 207.1	$ 36.7
Basic net income per share (in dollars per share)	$ 0.18	$ 0.28	$ 0.42	$ 0.19	$ 0.32	$ (0.05)	$ 0.31	$ 0.29	$ 1.06	$ 0.87	$ 0.15
Diluted net income per share (in dollars per share)	$ 0.18	$ 0.28	$ 0.42	$ 0.18	$ 0.32	$ (0.05)	$ 0.31	$ 0.28	$ 1.06	$ 0.85	$ 0.15
Expense recorded									$ 34.4	$ 79.8	$ 36.2
Subsidiaries [Member] | VENEZUELA
Quarterly Financial information
Operating Income (Loss)										2.8
Net income (loss) attributable to controlling interests										$ 5.8
Plant Closure Axalta Way Restructuring [Member]
Quarterly Financial information
Expense recorded		$ 70.6