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Fair Value Measurements (Details Textual)
$ in Millions
Sep. 30, 2021
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Senior notes $ 694.9
Convertible Notes Payable [Member] | Fair Value, Inputs, Level 2 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Convertible Debt, Fair Value Disclosures 603.1
Convertible Debt 464.2
Senior Notes [Member] | Fair Value, Inputs, Level 2 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Notes Payable, Fair Value Disclosure 710.3
Senior notes $ 694.9