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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill, gross   $ 28.0   $ 28.0
Goodwill, net   28.0   28.0
Finite-Lived Intangible Assets, Net [Abstract]        
Finite-lived intangible assets, accumulated amortization   (5.6)   (5.6)
Indefinite-lived Intangible Assets [Line Items]        
Intangible asset impairment charges   0.0 $ 113.4  
Intangible Assets, Net (Including Goodwill)        
Total goodwill and other intangible assets, gross   50.2   50.2
Finite-lived intangible assets, accumulated amortization   (5.6)   (5.6)
Intangible Assets, Net (Including Goodwill)   44.6   44.6
In-process research and development        
Indefinite-lived Intangible Assets [Line Items]        
Indefinite-lived intangible assets (excluding goodwill)   15.5   15.5
In-process research and development | Trevyent        
Indefinite-lived Intangible Assets [Line Items]        
Intangible asset impairment charges $ 107.3      
In-process research and development | Biomechanical Lungs        
Indefinite-lived Intangible Assets [Line Items]        
Intangible asset impairment charges $ 6.1      
Technology, patents, and trade names        
Finite-Lived Intangible Assets, Net [Abstract]        
Finite-lived intangible assets, gross   6.7   6.7
Finite-lived intangible assets, accumulated amortization   (5.6)   (5.6)
Finite-lived intangible assets, net   1.1   1.1
Intangible Assets, Net (Including Goodwill)        
Finite-lived intangible assets, accumulated amortization   $ (5.6)   $ (5.6)