Pension Benefits - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost			$ 24,300,000	$ 27,500,000	$ 30,600,000
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Settlement of asset retirement obligations			70,200,000
Settlement of asset retirement obligations			55,500,000
Assets for plan benefits	$ 0		0	16,300,000		$ 17,800,000
Settlement adjustment		$ 2,700,000
Reversion of assets	4,700,000
Corporate use	13,100,000		13,100,000
Reversion of assets, expenses	7,300,000
Excise tax	2,600,000		2,600,000
Unfunded liability	0		0	(16,300,000)
Pension expense			(2,600,000)	71,100,000	3,800,000
Unrecognized pension gain (loss) arising during the year			0	0	12,000,000.0
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Unfunded liability	$ 20,100,000		20,100,000	21,800,000
Pension expense			1,000,000.0	1,000,000.0	800,000
Unrecognized pension gain (loss) arising during the year			$ 800,000	$ (700,000)	$ 4,800,000