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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2020
Unrecognized Tax Benefits        
Unrecognized tax benefits at the beginning of period $ 23.5 $ 32.1 $ 37.6 $ 21.7
Gross increases - current year tax positions 13.9 0.9 1.4 1.6
Gross increases - prior year tax positions 1.0 1.6 1.1 0.7
Gross decreases - prior year tax positions (0.1) (2.0) (2.8) 0.0
Gross decreases - settlements 0.0 (0.7) (5.1) 0.0
Gross decreases - statute lapse (0.7) 0.0 (0.1) (0.5)
Unrecognized tax benefits at end of year 37.6 31.9 32.1 23.5
Interest and penalties in year-end balance $ 2.2 $ 4.1 $ 3.3 $ 1.4