Acquisitions and Dispositions - Actual and Pro Forma Financial Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Actual financial results of acquiree since acquisition date
Net income	$ 26.1	$ 198.7	$ 77.7	$ 289.6
Hitpoint, Perryville, Sam Houston And theScore
Actual financial results of acquiree since acquisition date
Revenues		1,580.8		2,886.8
Net income		$ 191.6		$ 227.7