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Investments in Unconsolidated Affiliates - Detail (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Investments in Unconsolidated Affiliates        
Investments in unconsolidated affiliates   $ 212.3   $ 188.1
Americas Styrenics        
Investments in Unconsolidated Affiliates        
Investments in unconsolidated affiliates   212.3   188.1
Investment in unconsolidated affiliates-difference between carrying amount and underlying equity   $ 7.8   $ (10.3)
Percentage of ownership underlying net assets   50.00%   50.00%
Amortized weighted average remaining useful life   1.9    
Dividends received from operating activities $ 40.0   $ 52.5