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Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Operating leases [Abstract]    
Operating leases right-of-use assets $ 1.5 $ 1.6
Current operating lease liabilities $ 0.7 $ 3.1
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other current liabilities Other current liabilities
Non-current operating lease liabilities $ 1.3 $ 2.9
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent Other Liabilities, Noncurrent
Components of Lease Cost [Abstract]    
Operating lease expense $ 4.1 $ 6.3
Short-term operating lease expense 0.0 0.0
Total operating lease expense 4.1 6.3
Sublease income $ 2.4 $ 1.8