Shareholders' Equity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 31, 2021
Schedule of Equity [Line Items]
Purchase for treasury	$ 750.0	$ 1,500.0	$ 1,250.0
Preferred stock, shares authorized (in shares)	5,000,000
Shares issued (in shares)	0	0
Shares held in employee trust (in shares)	50,000,000	50,000,000
Employee benefit trust	$ 3,013.2	$ 3,013.2
May 2021 Share Repurchase Program
Schedule of Equity [Line Items]
Remaining authorized repurchase amount	$ 2,500.0
Stock repurchase program, authorized amount				$ 5,000.0