Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions | Total | Total PolyOne shareholders' equity | Common Shares | Common Shares Held in Treasury | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Non-controlling Interests |
Beginning balance at Dec. 31, 2017 | $ 599.4 | $ 598.5 | $ 1.2 | $ (898.3) | $ 1,161.5 | $ 387.1 | $ (53) | $ 0.9 |
Beginning balance (in shares) at Dec. 31, 2017 | | | 122.2 | | | | | |
Beginning Balance, Treasury shares (in shares) at Dec. 31, 2017 | | | | (41.3) | | | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | |
Net income | 46.9 | 46.9 | | | | 46.9 | | |
Other comprehensive gain (loss) | 10.6 | 10.6 | | | | | 10.6 | |
Cash dividends declared | (14) | (14) | | | | (14) | | |
Repurchase of common shares | (42.2) | (42.2) | | $ (42.2) | | | | |
Repurchase of common shares (in shares) | | | | (1) | | | | |
Share-based compensation and exercise of awards | 1.4 | 1.4 | | $ 1.2 | 0.2 | | | |
Share-based compensation and exercise of awards (in shares) | | | | 0.1 | | | | |
Other | (17) | (17) | | | | (16.6) | (0.4) | |
Ending balance at Mar. 31, 2018 | 585.1 | 584.2 | $ 1.2 | $ (939.3) | 1,161.7 | 403.4 | (42.8) | 0.9 |
Ending balance (in shares) at Mar. 31, 2018 | | | 122.2 | | | | | |
Ending Balance, Treasury shares (in shares) at Mar. 31, 2018 | | | | (42.2) | | | | |
Beginning balance at Dec. 31, 2017 | 599.4 | 598.5 | $ 1.2 | $ (898.3) | 1,161.5 | 387.1 | (53) | 0.9 |
Beginning balance (in shares) at Dec. 31, 2017 | | | 122.2 | | | | | |
Beginning Balance, Treasury shares (in shares) at Dec. 31, 2017 | | | | (41.3) | | | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | |
Net income | 98.1 | | | | | | | |
Ending balance at Jun. 30, 2018 | 594.7 | 593.9 | $ 1.2 | $ (942) | 1,163.5 | 440.8 | (69.6) | 0.8 |
Ending balance (in shares) at Jun. 30, 2018 | | | 122.2 | | | | | |
Ending Balance, Treasury shares (in shares) at Jun. 30, 2018 | | | | (42.3) | | | | |
Beginning balance at Mar. 31, 2018 | 585.1 | 584.2 | $ 1.2 | $ (939.3) | 1,161.7 | 403.4 | (42.8) | 0.9 |
Beginning balance (in shares) at Mar. 31, 2018 | | | 122.2 | | | | | |
Beginning Balance, Treasury shares (in shares) at Mar. 31, 2018 | | | | (42.2) | | | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | |
Net income | 51.2 | 51.3 | | | | 51.3 | | (0.1) |
Other comprehensive gain (loss) | (26.8) | (26.8) | | | | | (26.8) | |
Cash dividends declared | (13.9) | (13.9) | | | | (13.9) | | |
Repurchase of common shares | (3.1) | (3.1) | | $ (3.1) | | | | |
Repurchase of common shares (in shares) | | | | (0.1) | | | | |
Share-based compensation and exercise of awards | 2.2 | 2.2 | | $ 0.4 | 1.8 | | | |
Ending balance at Jun. 30, 2018 | 594.7 | 593.9 | $ 1.2 | $ (942) | 1,163.5 | 440.8 | (69.6) | 0.8 |
Ending balance (in shares) at Jun. 30, 2018 | | | 122.2 | | | | | |
Ending Balance, Treasury shares (in shares) at Jun. 30, 2018 | | | | (42.3) | | | | |
Beginning balance at Dec. 31, 2018 | 540.6 | 540 | $ 1.2 | $ (1,018.7) | 1,166.9 | 472.9 | (82.3) | 0.6 |
Beginning balance (in shares) at Dec. 31, 2018 | | | 122.2 | | | | | |
Beginning Balance, Treasury shares (in shares) at Dec. 31, 2018 | | | | (44.5) | | | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | |
Net income | 38.3 | 38.2 | | | | 38.2 | | 0.1 |
Other comprehensive gain (loss) | 3.2 | 3.2 | | | | | 3.2 | |
Cash dividends declared | (14.8) | (14.8) | | | | (14.8) | | |
Repurchase of common shares | 0 | 0 | | | | | | |
Share-based compensation and exercise of awards | 1.6 | 1.6 | | $ 1.1 | 0.5 | | | |
Share-based compensation and exercise of awards (in shares) | | | | 0.1 | | | | |
Ending balance at Mar. 31, 2019 | 568.9 | 568.2 | $ 1.2 | $ (1,017.6) | 1,167.4 | 496.3 | (79.1) | 0.7 |
Ending balance (in shares) at Mar. 31, 2019 | | | 122.2 | | | | | |
Ending Balance, Treasury shares (in shares) at Mar. 31, 2019 | | | | (44.4) | | | | |
Beginning balance at Dec. 31, 2018 | 540.6 | 540 | $ 1.2 | $ (1,018.7) | 1,166.9 | 472.9 | (82.3) | 0.6 |
Beginning balance (in shares) at Dec. 31, 2018 | | | 122.2 | | | | | |
Beginning Balance, Treasury shares (in shares) at Dec. 31, 2018 | | | | (44.5) | | | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | |
Net income | 80.4 | | | | | | | |
Ending balance at Jun. 30, 2019 | 571.1 | 570.4 | $ 1.2 | $ (1,043.8) | 1,169.2 | 523.2 | (79.4) | 0.7 |
Ending balance (in shares) at Jun. 30, 2019 | | | 122.2 | | | | | |
Ending Balance, Treasury shares (in shares) at Jun. 30, 2019 | | | | (45.3) | | | | |
Beginning balance at Mar. 31, 2019 | 568.9 | 568.2 | $ 1.2 | $ (1,017.6) | 1,167.4 | 496.3 | (79.1) | 0.7 |
Beginning balance (in shares) at Mar. 31, 2019 | | | 122.2 | | | | | |
Beginning Balance, Treasury shares (in shares) at Mar. 31, 2019 | | | | (44.4) | | | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | | | |
Net income | 42.1 | 42.1 | | | | 42.1 | | |
Other comprehensive gain (loss) | (0.3) | (0.3) | | | | | (0.3) | |
Cash dividends declared | (15.2) | (15.2) | | | | (15.2) | | |
Repurchase of common shares | (26.9) | (26.9) | | $ (26.9) | | | | |
Repurchase of common shares (in shares) | | | | (1) | | | | |
Share-based compensation and exercise of awards | 2.5 | 2.5 | | $ 0.7 | 1.8 | | | |
Share-based compensation and exercise of awards (in shares) | | | | 0.1 | | | | |
Ending balance at Jun. 30, 2019 | $ 571.1 | $ 570.4 | $ 1.2 | $ (1,043.8) | $ 1,169.2 | $ 523.2 | $ (79.4) | $ 0.7 |
Ending balance (in shares) at Jun. 30, 2019 | | | 122.2 | | | | | |
Ending Balance, Treasury shares (in shares) at Jun. 30, 2019 | | | | (45.3) | | | | |