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Revenue Recognition - Textuals (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2022
Jun. 30, 2021
Dec. 31, 2019
Accounts Receivable [Member]              
Disaggregation of Revenue [Line Items]              
Accounts Receivable, Allowance for Credit Loss $ 0.0   $ 0.0       $ 0.0
Accounts Receivable, Credit Loss Expense (Reversal) 0.0 $ (0.1) 0.0 $ (0.1)      
Miscellaneous Receivables [Member]              
Disaggregation of Revenue [Line Items]              
Accounts Receivable, Allowance for Credit Loss $ 0.0   $ 0.0       $ 0.0
Scenario, Forecast | One year or longer              
Disaggregation of Revenue [Line Items]              
Deferred Revenue           $ 4,100.0  
Deferred Revenue, Percentage of Total, Expected to be Recognized in Next Twelve Months           43.00%  
Deferred Revenue, Percentage of Total, Expected to be Recognized Beyond Twelve Months         57.00%