Fair Value Measurements - Carrying Amount and Fair Value of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Publicly traded debt | Carrying Amount
Debt Instrument [Line Items]
Debt fair value	$ 9,475.8	$ 9,590.0	$ 8,849.6
Publicly traded debt | Fair Value
Debt Instrument [Line Items]
Debt fair value	8,615.1	8,382.3	9,777.4
Non-traded debt | Carrying Amount
Debt Instrument [Line Items]
Debt fair value	0.9	1.6	1.9
Non-traded debt | Fair Value
Debt Instrument [Line Items]
Debt fair value	$ 0.8	$ 1.5	$ 1.9