SEGMENT INFORMATION (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Sales By Geographic Area [Abstract]
Sales	$ 587.6	$ 581.2	$ 508.7	$ 507.2	$ 445.8	$ 550.2	$ 529.1	$ 436.0	$ 2,184.7	$ 1,961.1	$ 1,585.9
Total assets	2,777.7				2,449.6				2,777.7	2,449.6
Export sales from the United States to unaffiliated customers									25.1	22.0	22.1
United States [Member]
Sales By Geographic Area [Abstract]
Sales									1,970.5	1,774.0	1,425.7
Transfers between areas									53.5	50.0	39.4
Total assets	2,520.8				2,208.8				2,520.8	2,208.8
Foreign [Member]
Sales By Geographic Area [Abstract]
Sales									214.2	187.1	160.2
Transfers between areas									85.5	95.3	66.1
Total assets	256.9				240.8				256.9	240.8
Intersegment Elimination [Member]
Sales By Geographic Area [Abstract]
Transfers between areas									$ (139.0)	$ (145.3)	$ (105.5)