Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Other comprehensive income/(loss), tax (benefit) expense	$ 15.4	$ 41.3	$ 6.7
Reclassifications to earnings of realized gains/(losses) on available-for-sale securities	5.6	$ 0.0	$ 0.0
Net gain recorded on hedges	75.0
Net gain recorded on hedges, Net of tax	$ 23.3