Consolidated Statements of Cash Flows - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Operating Activities
Net Income (Loss) Attributable to Parent	$ 63,300,000	$ 2,600,000	$ 140,700,000	$ 78,400,000
Adjustments to reconcile income to net cash provided by operating activities:
Depreciation expense			189,700,000	186,100,000
Net gains on sales of assets			(89,000,000.0)	(77,300,000)
Asset Impairment Charges	0	31,500,000	1,200,000	31,500,000
Deferred income taxes			27,800,000	15,600,000
Share of affiliates’ earnings, net of dividends			(34,700,000)	(7,300,000)
Changes in working capital items			22,700,000	(10,500,000)
Net cash provided by operating activities			258,400,000	216,500,000
Investing Activities
Portfolio investments and capital additions			(873,600,000)	(684,500,000)
Portfolio proceeds			166,500,000	160,800,000
Proceeds from sales of other assets			10,900,000	19,400,000
Other			1,600,000	28,200,000
Net cash used in investing activities			(544,600,000)	(476,100,000)
Financing Activities
Net proceeds from issuances of debt (original maturities longer than 90 days)			585,400,000	395,100,000
Repayments of debt (original maturities longer than 90 days)			(250,000,000.0)	(250,000,000.0)
Net (decrease) increase in debt with original maturities of 90 days or less			(6,800,000)	3,400,000
Stock repurchases			0	(39,200,000)
Dividends			(40,800,000)	(39,200,000)
Purchases of assets previously leased			0	(1,500,000)
Other			11,100,000	30,400,000
Net cash provided by financing activities			298,900,000	99,000,000.0
Effect of Exchange Rate Changes on Cash and Cash Equivalents			1,000,000.0	(3,400,000)
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	$ 317,700,000	$ 180,500,000	317,700,000	180,500,000	$ 304,000,000.0
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total			13,700,000	(164,000,000.0)
Payments to Acquire Short-Term Investments			$ 150,000,000.0	$ 0