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Revenue Recognition and Contracts with Customers (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]      
Deferred contract liability $ 18.5 $ 21.2  
Revenue previously deferred 16.4 20.7  
Accrued liability     $ 4.0
Deferred contract liability 9.6 7.4  
Increase in deferred contract liability     6.9
Decrease in accounts payable and accrued expenses     4.0
Increase in deferred tax asset     0.7
Decrease in retained earnings     $ (2.2)
Net decrease in firearms sales 2.1 0.5  
Promotional expenses reclassified $ 9.6 $ 12.1  
Gross margin reduced 3.00% 3.00%