Recently Issued And Adopted Accounting Pronouncements (Details Textual) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) shares
Recently Issued And Adopted Accounting Pronouncements [Line Items]
Incremental shares from assumed conversion of convertible debentures | shares	2.8
ASU 2020-06 [Member]
Recently Issued And Adopted Accounting Pronouncements [Line Items]
Accounting for convertible instruments, Debt Modification, Increase (Decrease) in Debt Discounts, before Tax Amount	$ (56.8)
Accounting for convertible instruments, Debt Modification, Increase (Decrease) in Equity, Tax Amount	(15.0)
ASU 2020-06 [Member] | Additional Paid-in Capital [Member]
Recently Issued And Adopted Accounting Pronouncements [Line Items]
Accounting for convertible instruments, Debt Modification, Increase (Decrease) in Equity, before Tax Amount	(99.7)
Accounting for convertible instruments, Debt Modification, Increase (Decrease) in Equity, Tax Amount	25.6
ASU 2020-06 [Member] | Retained Earnings [Member]
Recently Issued And Adopted Accounting Pronouncements [Line Items]
Accounting for convertible instruments, Debt Modification, Increase (Decrease) in Equity, before Tax Amount	42.9
Accounting for convertible instruments, Debt Modification, Increase (Decrease) in Equity, Tax Amount	$ (10.6)
ASU 2020-06 [Member] | Treasury Stock [Member]
Recently Issued And Adopted Accounting Pronouncements [Line Items]
Incremental shares from assumed conversion of convertible debentures | shares	2.8