Investments (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 79.0		$ 79.0		$ 93.7
Company sold its interest in a marketable equity security	$ 9.9
Gain (loss) on marketable equity securities		0.0	$ (0.8)	4.1	$ (8.6)
Investments in marketable equity securities		0.0		0.0		5.8
Investments in non-marketable equity securities		42.7		42.7		$ 37.7
Targeted Streaming Service
Schedule of Equity Method Investments [Line Items]
Investments in non-marketable equity securities		$ 5.0		$ 5.0