CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 1,521.9	$ 1,503.1	$ 823.4
Other comprehensive (loss) income, net of tax (Note 15):
Foreign currency translation adjustments	(46.3)	(50.1)	32.4
Unrealized (loss) gain on hedges	(5.9)	57.4	(40.2)
Unrealized pension credits (costs)	13.7	11.6	(4.2)
Unrealized (loss) gain on available-for-sale investments	(77.5)	(24.1)	6.6
Reclassification of net realized investment loss to earnings	18.8	8.6	0.3
Other comprehensive (loss) income, net of tax	(97.2)	3.4	(5.1)
Comprehensive income	$ 1,424.7	$ 1,506.5	$ 818.3