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LONG-TERM DEBT: (Details) In Millions, unless otherwise specified									1 Months Ended			1 Months Ended
	Mar. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2013 Term loan A USD ($)	Dec. 31, 2012 Term loan A USD ($)	Mar. 31, 2013 Term loan B USD ($)	Dec. 31, 2012 Term loan B USD ($)	Mar. 31, 2013 2020 Unsecured Senior Notes USD ($)	Dec. 31, 2012 2020 Unsecured Senior Notes USD ($)	Mar. 31, 2013 Titanium Dioxide Pigments venture facility agreement Sachtleben GmbH USD ($)	Mar. 31, 2013 Titanium Dioxide Pigments venture facility agreement Sachtleben GmbH EUR (€)	Dec. 31, 2012 Titanium Dioxide Pigments venture term loans USD ($)	Mar. 31, 2013 Titanium Dioxide Pigments venture, Term loan A Sachtleben GmbH USD ($)	Mar. 31, 2013 Titanium Dioxide Pigments venture, Term loan A Sachtleben GmbH EUR (€)	Mar. 31, 2013 Titanium Dioxide Pigments venture, Term loan B Sachtleben GmbH USD ($)	Mar. 31, 2013 Titanium Dioxide Pigments venture, Term loan B Sachtleben GmbH EUR (€)	Mar. 31, 2013 Titanium Dioxide Pigments venture, revolving credit facility Sachtleben GmbH USD ($)	Mar. 31, 2013 Titanium Dioxide Pigments venture, revolving credit facility Sachtleben GmbH EUR (€)	Mar. 31, 2013 Capitalized lease obligations USD ($)	Dec. 31, 2012 Capitalized lease obligations USD ($)	Mar. 31, 2013 Other loans USD ($)	Dec. 31, 2012 Other loans USD ($)
Long-term debt and loans payable
Long-term debt	$ 2,222.0	$ 2,751.8	$ 323.7	$ 336.9	$ 587.3	$ 587.3	$ 1,250.0	$ 1,250.0			$ 514.5							$ 31.9	$ 33.5	$ 29.1	$ 29.6
Current maturities	(43.2)	(553.7)
Long-term debt excluding current maturities	2,178.8	2,198.1
Outstanding borrowings repaid									$ 512.4	€ 394.5		$ 246.8	€ 190.0	$ 259.8	€ 200.0	$ 5.8	€ 4.5