Severance and Retention Costs related to our Restructured Operations, Restructured North American TEGSEDI Operations (Details) - Restructured North American TEGSEDI Operations [Member] $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Severance and Retention Costs [Abstract]
Beginning balance	$ 0.0
Net amount expensed during the year	9.4
Amounts paid during the year	(9.4)
Ending balance	0.0
R&D Expenses [Member]
Severance and Retention Costs [Abstract]
Net amount expensed during the year	2.3
SG&A Expenses [Member]
Severance and Retention Costs [Abstract]
Net amount expensed during the year	$ 7.1