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Income Taxes - Net Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]        
Deferred income taxes $ 9.7 $ 7.8    
Other noncurrent liabilities 1.3 1.3    
Net unrecognized tax benefits 11.0 9.1    
Gross unrecognized tax benefits $ 11.0 $ 9.1 $ 16.5 $ 14.0