FAIR VALUE MEASUREMENTS (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Feb. 28, 2011	Dec. 31, 2010
Assets
Interest rate swaps	$ 15.1	$ 15.5		$ 9.1
Commodity forward contracts		10.4		16.9
Liabilities
Interest rate swaps	15.1	15.6		9.3
Earn out	44.9
Foreign currency contracts		0.1
Commodity forward contracts	14.7	0.8		0.2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Assets measured at fair value on a nonrecurring basis			180.6
Gain on acquisition of Sunbelt	181.4	0
PolyOne Corporation's interest in SunBelt (in hundredths)	50.00%
Fair Value Measurements Level 1 [Member]
Assets
Interest rate swaps	0	0		0
Commodity forward contracts		4.2		7.0
Liabilities
Interest rate swaps	0	0		0
Earn out	0
Foreign currency contracts		0.1
Commodity forward contracts	4.8	0		0
Fair Value Measurements Level 2 [Member]
Assets
Interest rate swaps	15.1	15.5		9.1
Commodity forward contracts		6.2		9.9
Liabilities
Interest rate swaps	15.1	15.6		9.3
Earn out	0
Foreign currency contracts		0
Commodity forward contracts	9.9	0.8		0.2
Fair Value Measurements Level 3 [Member]
Assets
Interest rate swaps	0	0		0
Commodity forward contracts		0		0
Liabilities
Interest rate swaps	0	0		0
Earn out	44.9
Foreign currency contracts		0
Commodity forward contracts	0	0		0
Financial Instruments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of year	0	0
Unrealized loss included in other (expense) income	(2.6)	0
Purchases, sales and settlements	(42.3)	0
Balance at end of period	(44.9)	0
Long term Debt Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of debt	610.9	420.3		530.3
Long Term Debt Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of debt	$ 589.6	$ 386.9		$ 496.0