Consolidated Statements Of Comprehensive Income (Parenthetical) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Other comprehensive income/(loss), tax	$ 12.1	$ 1.9	$ 50.7	$ 2.0
Reclassifications to earnings of realized gains/(losses) on available-for-sale securities	0.0	$ 0.0	0.0	$ 0.0
Cumulative gain recognized on hedges	$ 43.7		$ 93.9