Annual report pursuant to Section 13 and 15(d)

Investments (Details)

v3.20.4
Investments (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investment [Line Items]      
Due to Affiliate $ 44,700,000 $ 27,300,000  
Related Party Transaction, Purchases from Related Party $ 91,000,000.0 $ 102,600,000 $ 117,100,000
Gain (Loss) on Sale of Equity Investments     $ 2,300,000
Bella [Member]      
Investment [Line Items]      
Percentage of Ownership in Bella     36.00%
TMC [Member]      
Investment [Line Items]      
Percentage of Ownership in Bella 50.00%