Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Operating Activities
Net Income (Loss) Attributable to Parent	$ 207,700,000	$ 193,200,000
Depreciation, Depletion and Amortization	311,800,000	289,800,000
Adjustments to reconcile income to net cash provided by operating activities:
Net gains on sales of assets	(110,000,000.0)	(105,600,000)
Asset Impairment Charges	0	1,200,000
Deferred income taxes	42,000,000.0	38,700,000
Share of affiliates’ earnings, net of dividends	(58,700,000)	(48,100,000)
Changes in working capital items	3,300,000	30,900,000
Net cash provided by operating activities	396,100,000	400,100,000
Investing Activities
Portfolio investments and capital additions	(1,325,100,000)	(1,237,500,000)
Portfolio proceeds	171,700,000	208,200,000
Proceeds from sales of other assets	20,200,000	16,400,000
Other	1,800,000	2,300,000
Net cash used in investing activities	(1,131,400,000)	(860,600,000)
Financing Activities
Net proceeds from issuances of debt (original maturities longer than 90 days)	1,297,000,000	909,200,000
Repayments of debt (original maturities longer than 90 days)	(413,500,000)	(500,000,000.0)
Net decrease in debt with original maturities of 90 days or less	0	(5,000,000.0)
Stock repurchases	(21,800,000)	0
Dividends	(63,900,000)	(60,700,000)
Other	21,700,000	16,400,000
Net cash provided by financing activities	789,100,000	359,900,000
Effect of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash	(800,000)	(200,000)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance	450,800,000	304,000,000.0
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance	503,800,000	203,200,000
Non-cash financing lease transactions	30,100,000	0
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	53,000,000.0	(100,800,000)
Payments to Acquire Short-Term Investments	0	150,000,000.0
Payments for Previously Leased Assets	$ 30,400,000	$ 0