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Financing Agreement - Additional Information (Detail)
$ in Millions
1 Months Ended
Jun. 30, 2021
USD ($)
Dec. 31, 2010
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jul. 31, 2018
USD ($)
Jul. 02, 2018
USD ($)
Mar. 31, 2016
USD ($)
Term loan              
Debt Instrument [Line Items]              
Maximum borrowing capacity         $ 1,180.0    
Revolving loan facility     $ 888.0 $ 940.0      
Revolving Credit Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 1,000.0            
Revolving loan facility     210.0 0.0      
Repayments of principal in next twelve months     45.0        
Minimum interest coverage ratio 3.00            
Maximum leverage ratio 3.50            
Senior Notes | Senior Unsecured Notes 4.60% Due May 2021              
Debt Instrument [Line Items]              
Proceeds from Issuance of Debt   $ 75.0          
Long-term debt     0.0 75.0      
Senior Notes | Senior Unsecured Notes 4.23% Due July 2028              
Debt Instrument [Line Items]              
Long-term debt     350.0 350.0      
Notes payable, other | Boat Holdings, LLC              
Debt Instrument [Line Items]              
Long-term debt     61.0     $ 76.7  
Notes payable to banks              
Debt Instrument [Line Items]              
Long-term debt     68.3 $ 75.0      
Notes payable to banks | Mortgages              
Debt Instrument [Line Items]              
Long-term debt     $ 7.3       $ 14.5