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Investments in Unconsolidated Affiliates - Americas Styrenics (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Investments in Unconsolidated Affiliates            
Investments in unconsolidated affiliates $ 253,200,000   $ 253,200,000     $ 240,100,000
Americas Styrenics            
Investments in Unconsolidated Affiliates            
Investments in unconsolidated affiliates 253,200,000   253,200,000     240,100,000
Investment in unconsolidated affiliates-difference between carrying amount and underlying equity $ 12,000,000.0   $ 12,000,000.0     $ 16,300,000
Percentage of ownership underlying net assets 50.00%   50.00%   50.00% 50.00%
Amortized weighted average remaining useful life     2.8      
Dividends received from operating activities $ 25,000,000.0 $ 0 $ 40,000,000.0 $ 0