Quarterly report pursuant to Section 13 or 15(d)

Revenue and Expense from Contracts with Customers (Detail Textuals)

v3.19.3
Revenue and Expense from Contracts with Customers (Detail Textuals)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Receivables from customers included in accounts receivable, net $ 15.9 $ 17.3
Contract with customer liability $ 1,400.0 $ 1,200.0
Percentage refundable on cancellation 55.00%  
Revenue recognized included in contract liability $ 1,200.0  
Number of reportable segments | segment 1  
Revenue    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Concentration risk, benchmark No other individual country’s revenues exceed 10% in any given period.  
Revenue | Minimum    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Percentage of revenue attributable to U.S.- sourced passengers 75.00%  
Revenue | Maximum    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Percentage of revenue attributable to U.S.- sourced passengers 80.00%