Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Activities
Net Income (Loss) Attributable to Parent	$ 74,300,000	$ 77,400,000
Depreciation, Depletion and Amortization	100,600,000	93,600,000
Adjustments to reconcile income to net cash provided by operating activities:
Net gains on sales of assets	(36,100,000)	(48,100,000)
Asset Impairment Charges	0	1,200,000
Deferred income taxes	15,900,000	14,100,000
Share of affiliates’ earnings, net of dividends	(19,700,000)	(20,700,000)
Changes in working capital items	(37,400,000)	(22,500,000)
Net cash provided by operating activities	97,600,000	95,000,000.0
Investing Activities
Portfolio investments and capital additions	(378,600,000)	(387,000,000.0)
Portfolio proceeds	59,700,000	108,200,000
Proceeds from sales of other assets	7,100,000	5,200,000
Other	200,000	700,000
Net cash used in investing activities	(311,600,000)	(122,900,000)
Financing Activities
Net proceeds from issuances of debt (original maturities longer than 90 days)	557,400,000	165,400,000
Repayments of debt (original maturities longer than 90 days)	(300,000,000.0)	(250,000,000.0)
Net increase in debt with original maturities of 90 days or less	0	2,800,000
Stock repurchases	(4,600,000)	0
Dividends	(22,000,000.0)	(20,900,000)
Other	14,200,000	4,400,000
Net cash provided by (used in) financing activities	245,000,000.0	(98,300,000)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(2,600,000)	(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	479,200,000	177,600,000
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	28,400,000	(126,400,000)
Payments to Acquire Short-Term Investments	$ 0	$ 150,000,000.0