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Leases Leases Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating Lease, Right-of-Use Asset $ 35.8 $ 58.1
Current lease liability 15.7 21.1
Long-term lease liability 21.6 51.8
Total operating lease liabilities $ 37.3 $ 72.9
Weighted-average remaining lease term (in years) 4 years 3 months 18 days 5 years 1 month 6 days
Weighted-average discount rate (1) 8.24% 8.23%
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent