Segment Information (Schedule Of Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015	[2]	Jun. 30, 2015	[3]	Mar. 31, 2015	[4]	Dec. 31, 2014		Sep. 30, 2014	[6]	Jun. 30, 2014	[7]	Mar. 31, 2014	[8]	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Segment Reporting Information [Line Items]
Sales:	$ 775.8	[1]	$ 841.6		$ 887.1		$ 873.1		$ 869.3	[5]	$ 958.4		$ 1,005.5		$ 1,002.3		$ 3,377.6	$ 3,835.5		$ 3,771.2
Intersegment Sales																	0.0	0.0		0.0
Operating Income	31.3	[1]	$ 69.2		$ 80.3		$ 70.1		(14.3)	[5]	$ 63.6		$ 49.4		$ 56.4		250.9	155.1		231.5
Capital Expenditures																	91.2	92.8		76.4
Total Assets	2,595.1								2,666.3								2,595.1	2,666.3		2,896.6
Color, Additives and Inks
Segment Reporting Information [Line Items]
Sales:																	801.2	835.0		844.6
Intersegment Sales																	9.5	15.8		7.7
Operating Income																	135.4	124.9		104.0
Depreciation and amortization																	42.4	41.4	[9]	38.8	[10]
Capital Expenditures																	27.3	28.1		29.3	[11]
Total Assets	939.5								934.2								939.5	934.2		960.7
Specialty Engineered Materials
Segment Reporting Information [Line Items]
Sales:																	493.1	555.2		571.9
Intersegment Sales																	49.7	43.1		43.6
Operating Income																	79.6	72.4		57.2
Depreciation and amortization																	15.9	16.7	[9]	18.8	[10]
Capital Expenditures																	17.7	15.2		14.3	[11]
Total Assets	353.4								370.1								353.4	370.1		378.4
Designed Structures and Solutions
Segment Reporting Information [Line Items]
Sales:																	448.8	616.5		597.3
Intersegment Sales																	4.7	1.0		0.1
Operating Income																	13.8	45.1		33.4
Depreciation and amortization																	16.9	19.8	[9]	21.2	[10]
Capital Expenditures																	18.4	25.6		13.4	[11]
Total Assets	449.5								490.1								449.5	490.1		523.1
Performance Products and Solutions
Segment Reporting Information [Line Items]
Sales:																	615.8	728.2		690.9
Intersegment Sales																	78.3	88.4		82.3
Operating Income																	57.4	63.1		56.0
Depreciation and amortization																	16.2	17.7	[9]	15.5	[10]
Capital Expenditures																	9.8	15.2		12.4	[11]
Total Assets	237.4								265.5								237.4	265.5		276.3
PolyOne Distribution
Segment Reporting Information [Line Items]
Sales:																	1,018.7	1,100.6		1,066.5
Intersegment Sales																	15.4	13.8		8.7
Operating Income																	68.0	68.2		63.3
Depreciation and amortization																	0.7	0.6	[9]	0.6	[10]
Capital Expenditures																	0.4	0.1		0.3	[11]
Total Assets	200.0								214.2								200.0	214.2		216.7
Resin Business
Segment Reporting Information [Line Items]
Capital Expenditures																				0.2
Depreciation expense																				1.0
Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization																	104.3	123.9	[9]	108.8	[10]
Capital Expenditures																	91.2	92.8		76.2	[11]
Operating Segments | Color, Additives and Inks
Segment Reporting Information [Line Items]
Sales:																	810.7	850.8		852.3
Operating Segments | Specialty Engineered Materials
Segment Reporting Information [Line Items]
Sales:																	542.8	598.3		615.5
Operating Segments | Designed Structures and Solutions
Segment Reporting Information [Line Items]
Sales:																	453.5	617.5		597.4
Operating Segments | Performance Products and Solutions
Segment Reporting Information [Line Items]
Sales:																	694.1	816.6		773.2
Operating Segments | PolyOne Distribution
Segment Reporting Information [Line Items]
Sales:																	1,034.1	1,114.4		1,075.2
Corporate and eliminations
Segment Reporting Information [Line Items]
Sales:																	(157.6)	(162.1)		(142.4)
Intersegment Sales																	(157.6)	(162.1)		(142.4)
Operating Income																	(103.3)	(218.6)		(82.4)
Depreciation and amortization																	12.2	27.7	[9]	13.9	[10]
Capital Expenditures																	17.6	8.6		6.5	[11]
Total Assets	$ 415.3								$ 392.2								$ 415.3	$ 392.2		$ 541.4

[1] Included for the fourth quarter 2015 are: 1) a mark-to-market pension and other post-retirement charge of $11.6 million, 2) employee separation and restructuring costs of $10.1 million and 3) $16.4 million of debt extinguishment costs primarily due to the repayment in full of $316.6 million aggregate principal amount of our 7.375% senior notes due 2020.

[2] Included for the third quarter 2015 are: 1) employee separation and restructuring costs of $13.7 million and 2) a $7.5 million benefit related to the reversal of an uncertain tax position due to the expiration of the statute of limitations.

[3] Included for the second quarter 2015 are: 1) employee separation and restructuring costs of $7.5 million and 2) a $26.0 million tax benefit as a result of amending U.S. federal income tax returns from 2005 to 2012 to use foreign tax credits.

[4] Included for the first quarter 2015 are employee separation and restructuring costs of $10.6 million.

[5] Included for the fourth quarter 2014 are: 1) a mark-to-market pension and other post-retirement charge of $56.5 million, 2) employee separation and restructuring costs of $23.2 million, 3) environmental remediation costs of $2.6 million and 5) a gain related to the reimbursement of previously incurred environmental costs of $2.1 million

[6] Included for the third quarter 2014 are: 1) employee separation and restructuring costs of $17.9 million, 2) environmental remediation costs of $5.9 million and 3) a gain related to the reimbursement of previously incurred environmental costs of

[7] Included for the second quarter 2014 are: 1) employee separation and restructuring costs of $35.1 million and 2) a $5.4 million tax benefit associated with our investments in certain foreign affiliates.

[8] Included for the first quarter 2014 are employee separation and restructuring costs of $17.9 million.

[9] Corporate and eliminations includes accelerated depreciation associated with restructuring actions of $23.1 million.

[10] Excludes $1.0 million of depreciation expense associated with the Resin Business. Corporate and eliminations includes accelerated depreciation associated with restructuring actions of $12.7 million.

[11] Excludes $0.2 million of capital expenditures associated with the Resin Business.