EARNINGS PER SHARE (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 102.2	$ 83.4	$ 186.5	$ 145.7
Shares:
Weighted average shares outstanding for basic earnings per share (in shares)	166,098,000	170,556,000	166,579,000	171,994,000
Effect of dilutive securities on weighted average shares:
Stock options, restricted stock and performance units (in shares)	1,880,000	1,796,000	2,249,000	1,714,000
Weighted average shares outstanding for diluted earnings per share (in shares)	167,978,000	172,352,000	168,828,000	173,708,000