Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial information
Total revenue	$ 1,165.8	$ 1,146.0	$ 1,212.2	$ 1,172.0	$ 1,172.4	$ 1,096.3	$ 1,094.6	$ 1,013.7	$ 4,696.0	$ 4,377.0	$ 4,092.7
Cost of goods sold	777.4	759.1	793.8	776.0	746.6	702.5	690.0	641.4	3,106.3	2,780.5	2,528.8
Operating Income (Loss)	127.8	47.8	146.5	120.0	101.9	103.9	47.5	110.4	442.1	363.7	405.1
Net income (loss)	76.8	(11.6)	77.1	71.0	(55.6)	56.3	(18.9)	65.9	213.3	47.7	44.6
Net income (loss) attributable to controlling interests	$ 75.4	$ (13.1)	$ 74.9	$ 69.9	$ (61.5)	$ 54.9	$ (20.8)	$ 64.1	$ 207.1	$ 36.7	$ 38.8
Basic net income per share (in dollars per share)	$ 0.32	$ (0.05)	$ 0.31	$ 0.29	$ (0.26)	$ 0.23	$ (0.09)	$ 0.27	$ 0.87	$ 0.15	$ 0.16
Diluted net income per share (in dollars per share)	$ 0.32	$ (0.05)	$ 0.31	$ 0.28	$ (0.26)	$ 0.22	$ (0.09)	$ 0.26	$ 0.85	$ 0.15	$ 0.16
Expense recorded									$ 79.8	$ 36.2	$ 58.5
Venezuela deconsolidation charge									$ 0.0	(70.9)	0.0
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)					$ 107.8
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) attributable to Controlling Interest					$ 112.5
Subsidiaries [Member] | VENEZUELA
Quarterly Financial information
Operating Income (Loss)										2.8	36.5
Net income (loss) attributable to controlling interests										$ 5.8	$ 68.5
Venezuela deconsolidation charge							$ 70.9
Plant Closure Axalta Way Restructuring [Member]
Quarterly Financial information
Expense recorded		$ 70.6