CHANGES IN COMMON STOCK (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	1 Months Ended	3 Months Ended		4 Months Ended	6 Months Ended
	May 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Apr. 30, 2020	Jun. 30, 2020	Jun. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased		$ 30.0	$ 55.0		$ 113.0	$ 102.0
Stock repurchase program, remaining repurchase authorized amount		419.3			419.3
Common stock dividends declared		$ 17.4	$ 17.6		$ 33.4	$ 33.7
Dividends (in dollars per share)	$ 0.12			$ 0.11	$ 0.23
Common stock
Equity, Class of Treasury Stock [Line Items]
Stock repurchased and retired during period (in shares)		1,968	3,342		7,051	6,235
Common stock repurchased					$ 0.1