Fair Value Measurements - Recurring Fair Value Measurements (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
ASSETS:
Cash equivalents	$ 229,700,000	$ 122,300,000
Trust assets	200,000	100,000
Derivative instruments	8,200,000	1,900,000
TOTAL	238,100,000	124,300,000
LIABILITIES:
Derivative instruments	120,600,000	66,000,000.0
TOTAL	120,600,000	66,000,000.0
Level 1
ASSETS:
Cash equivalents	229,700,000	122,300,000
Trust assets	200,000	100,000
Derivative instruments	0	0
TOTAL	229,900,000	122,400,000
LIABILITIES:
Derivative instruments	0	0
TOTAL	0	0
Level 2
ASSETS:
Cash equivalents	0	0
Trust assets	0	0
Derivative instruments	8,200,000	1,900,000
TOTAL	8,200,000	1,900,000
LIABILITIES:
Derivative instruments	120,600,000	66,000,000.0
TOTAL	120,600,000	66,000,000.0
Level 3
ASSETS:
Cash equivalents	0	0
Trust assets	0	0
Derivative instruments	0	0
TOTAL	0	0	$ 0
LIABILITIES:
Derivative instruments	0	0
TOTAL	$ 0	$ 0	$ 0