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EARNINGS PER SHARE - BASIC AND DILUTED EARNINGS PER SHARE (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 78.0	$ 82.0	$ 225.4	$ 60.8
Shares:
Weighted average shares outstanding for basic earnings per share (in shares)	131,016	143,421	132,578	144,625
Effect of dilutive securities on weighted average shares:
Amounts related to employee benefit plans (in shares)	2,798	520	2,655	644
Weighted average shares outstanding for diluted earnings per share (in shares)	133,814	143,941	135,233	145,269

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