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Debt - Cash Pooling (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
cash_pool
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]    
Number of cash pools | cash_pool 2  
JP Morgan Chase Bank    
Debt Instrument [Line Items]    
Number of cash pools | cash_pool 2  
Credit Agreement    
Debt Instrument [Line Items]    
Letters of credit outstanding $ 36,480,000  
Credit Agreement | Revolving Credit Facility    
Debt Instrument [Line Items]    
Letters of credit outstanding $ 3,039,000  
BMG QRS Cash Pool    
Debt Instrument [Line Items]    
Number of cash pools | cash_pool 1  
Cash Pool Agreement, Borrowings, Maximum $ 10,000,000  
BMG QRS Cash Pool | Bank Mendes Gans    
Debt Instrument [Line Items]    
GROSS CASH POSITION 552,900,000 $ 448,700,000
OUTSTANDING DEBIT BALANCES (552,100,000) (447,400,000)
NET CASH POSITION $ 800,000 1,300,000
BMG QRS Cash Pool | JP Morgan Chase Bank    
Debt Instrument [Line Items]    
Number of cash pools | cash_pool 1  
Cash Pool Agreement, Borrowings, Maximum $ 12,000,000  
GROSS CASH POSITION 9,400,000 0
OUTSTANDING DEBIT BALANCES (9,200,000) 0
NET CASH POSITION $ 200,000 0
BMG TRS Cash Pool    
Debt Instrument [Line Items]    
Number of cash pools | cash_pool 1  
BMG TRS Cash Pool | Bank Mendes Gans    
Debt Instrument [Line Items]    
GROSS CASH POSITION $ 606,000,000 555,500,000
OUTSTANDING DEBIT BALANCES (603,900,000) (553,500,000)
NET CASH POSITION $ 2,100,000 2,000,000
BMG TRS Cash Pool | JP Morgan Chase Bank    
Debt Instrument [Line Items]    
Number of cash pools | cash_pool 1  
Cash Pool Agreement, Borrowings, Maximum $ 10,000,000  
GROSS CASH POSITION 12,000,000 0
OUTSTANDING DEBIT BALANCES (9,900,000) 0
NET CASH POSITION $ 2,100,000 $ 0