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Contingencies (Details)
$ in Millions
 1 Months Ended 6 Months Ended
Apr. 26, 2015
Jan. 31, 2010
USD ($)
Apr. 30, 1999
USD ($)
Jun. 30, 2020
child
lawsuit
class
Nov. 11, 2014
USD ($)
Jul. 26, 2013
USD ($)
Yellowstone            
Loss Contingencies [Line Items]            
Alleged loss of profits     $ 1.0      
Unpaid accounts receivable     4.0      
Alleged business investments     3.0      
Initial estimate of loss of profits     $ 1.0      
Court awarded damages from counterclaim   $ 4.0        
Damages awarded, including attorney fees, inflation and interest           $ 17.0
Counter claim awarded, including inflation         $ 7.5 $ 7.5
Damages award including inflation and interest         $ 14.5  
Fine on claims (as a percent) 1.00%          
Sleeper            
Loss Contingencies [Line Items]            
Number of additional lawsuits pending | lawsuit       33    
Number of children with injuries or fatalities related to lawsuits | child       37    
Minimum | Sleeper            
Loss Contingencies [Line Items]            
Number of consumer classes | class       15