EARNINGS PER SHARE (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 129.2	$ 42.0	$ 190.0	$ 131.4
Shares:
Weighted average shares outstanding for basic earnings per share (in shares)	140,900	154,257	143,384	158,007
Effect of dilutive securities on weighted average shares:
Amounts related to employee benefit plans (in shares)	830	1,003	706	1,054
Weighted average shares outstanding for diluted earnings per share (in shares)	141,730	155,260	144,090	159,061