Debt (Issuance of 2018 Senior Notes) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term debt	$ 16,188.1	$ 18,015.2
Senior Notes | 2028 Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.55%
Senior Notes | 2048 Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.20%