Summary of Significant Accounting Policies - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Goodwill, gross	$ 28,000,000.0	$ 28,000,000.0
Goodwill, net	28,000,000.0	28,000,000.0
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, accumulated amortization	(5,600,000)	(5,500,000)
Indefinite-lived Intangible Assets [Line Items]
Intangible asset impairment charges	113,400,000	0	$ 0
Intangible Assets, Net (Including Goodwill) [Abstract]
Total goodwill and other intangible assets, gross	50,200,000	163,600,000
Finite-lived intangible assets, accumulated amortization	(5,600,000)	(5,500,000)
Intangible Assets, Net (Including Goodwill)	44,600,000	158,100,000
In-process research and development
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	15,500,000	128,900,000
Intangible asset impairment charges	113,400,000
In-process research and development | Trevyent
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets (excluding goodwill)		107,300,000
Intangible asset impairment charges	107,300,000
In-process research and development | Biomechanical Lungs
Indefinite-lived Intangible Assets [Line Items]
Intangible asset impairment charges	6,100,000
Technology, patents, and trade names
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	6,700,000	6,700,000
Finite-lived intangible assets, accumulated amortization	(5,600,000)	(5,500,000)
Finite-lived intangible assets, net	1,100,000	1,200,000
Intangible Assets, Net (Including Goodwill) [Abstract]
Finite-lived intangible assets, accumulated amortization	$ (5,600,000)	$ (5,500,000)