Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other comprehensive income/(loss), tax (benefit) expense	$ (6.7)	$ 11.5	$ 20.2
ASU 2019-04 [Member]
Increase in accumulated comprehensive income	$ 17.9