Affiliate Equity - Changes in the Company's Interest in its Affiliates on the Controlling Interest's Equity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Affiliate Equity [Abstract]
Net income (controlling interest)	$ 716.6	$ 511.6	$ 672.9
Decrease in controlling interest paid-in capital from Affiliate equity issuances	(18.4)	(3.1)	(13.5)
Decrease in controlling interest paid-in capital from Affiliate equity purchases	(47.9)	(32.6)	(50.4)
Net income (controlling interest) including the net impact of Affiliate equity transactions	$ 650.3	$ 475.9	$ 609.0