Consolidated Statements of Cash Flows - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Operating Activities
Net Income (Loss) Attributable to Parent	$ 52,500,000	$ 29,100,000	$ 193,200,000	$ 107,500,000
Adjustments to reconcile income to net cash provided by operating activities:
Depreciation expense			289,800,000	278,200,000
Net gains on sales of assets			(105,600,000)	(91,000,000.0)
Asset Impairment Charges	0	10,800,000	1,200,000	42,300,000
Deferred income taxes			38,700,000	24,000,000.0
Share of affiliates’ earnings, net of dividends			(48,100,000)	(14,800,000)
Changes in working capital items			30,900,000	6,400,000
Net cash provided by operating activities			400,100,000	352,600,000
Investing Activities
Portfolio investments and capital additions			(1,237,500,000)	(887,900,000)
Portfolio proceeds			208,200,000	224,900,000
Proceeds from sales of other assets			16,400,000	26,400,000
Other			2,300,000	30,100,000
Net cash used in investing activities			(860,600,000)	(606,500,000)
Financing Activities
Net proceeds from issuances of debt (original maturities longer than 90 days)			909,200,000	837,800,000
Repayments of debt (original maturities longer than 90 days)			(500,000,000.0)	(250,000,000.0)
Net (decrease) increase in debt with original maturities of 90 days or less			(5,000,000.0)	700,000
Stock repurchases			0	(47,200,000)
Dividends			(60,700,000)	(57,900,000)
Purchases of assets previously leased			0	(1,500,000)
Other			16,400,000	30,900,000
Net cash provided by financing activities			359,900,000	512,800,000
Effect of Exchange Rate Changes on Cash and Cash Equivalents			(200,000)	(6,800,000)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance			304,000,000.0	344,500,000	$ 344,500,000
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance	$ 203,200,000	$ 596,600,000	203,200,000	596,600,000	$ 304,000,000.0
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total			(100,800,000)	252,100,000
Payments to Acquire Short-Term Investments			$ 150,000,000.0	$ 0