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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Operating Leases    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets  
Operating lease right-of-use assets $ 29.6 $ 31.0
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other current liabilities  
Operating lease liabilities, current portion $ 5.7 5.4
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other liabilities  
Operating lease liabilities $ 25.9 27.8
Total operating lease liabilities $ 31.6 $ 33.2
Operating leases:    
Weighted average remaining lease term (years) 7 years 2 months 12 days 7 years 8 months 12 days
Operating leases:    
Weighted average discount rate 4.00% 4.10%