EARNINGS PER COMMON SHARE - EARNINGS PER SHARE COMPUTATION (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017
Basic Earnings Per Common Share Computation
Net income attributable to Dentsply Sirona	$ 39.2		$ 81.2
Weighted average common shares outstanding (in shares)	223.3		227.2
Earnings per common share - basic (in dollars per share)	$ 0.18		$ 0.36
Diluted Earnings Per Common Share Computation
Net income attributable to Dentsply Sirona	$ 39.2		$ 81.2
Weighted average common shares outstanding (in shares)	223.3		227.2
Incremental weighted average shares from assumed exercise of dilutive options from stock-based compensation awards (in shares)	1.7		2.7
Total weighted average diluted shares outstanding (in shares)	225.0		229.9
Earnings per common share - diluted (in dollars per share)	$ 0.17	$ 0.17	$ 0.35	$ 0.35