EQUITY METHOD INVESTMENT - Reconciliation of the Company’s Equity Method Investments (Details) $ in Millions	9 Months Ended
	Sep. 30, 2026 USD ($)
Equity Method Investments [Roll Forward]
Beginning balance	$ 125.5
Ending balance	3,246.1
GPGI Holdings
Equity Method Investments [Roll Forward]
Beginning balance	125.5
Stock-based compensation granted to GPGI Holdings' employees	7.9
Earnings (losses) in equity method investment of GPGI Holdings	(12.2)
Investment in GPGI Holdings in relation to Husky Transaction-Cash	1,962.0
Investment in GPGI Holdings in relation to Husky Transaction-Equity	1,143.0
Investments in GPGI Holdings	158.4
Distributions to GPGI, Inc.	(138.5)
Ending balance	$ 3,246.1

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.