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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Jun. 30, 2020
Jun. 30, 2019
Unrecognized Tax Benefits        
Unrecognized tax benefits at the beginning of period $ 23.5 $ 37.6 $ 21.7 $ 24.9
Gross increases - current year tax positions 13.9 1.4 1.6 2.2
Gross increases - prior year tax positions 1.0 1.1 0.7 0.5
Gross increases - acquisitions 0.0 0.0 0.0 2.3
Gross decreases - prior year tax positions (0.1) (2.8) 0.0 (0.1)
Gross decreases - settlements 0.0 (5.1) 0.0 (2.7)
Gross decreases - statute lapse (0.7) (0.1) (0.5) (5.4)
Unrecognized tax benefits at end of year 37.6 32.1 23.5 21.7
Interest and penalties in year-end balance $ 2.2 $ 3.3 $ 1.4 $ 0.8