Financial Instruments and Fair Values - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Designated as hedging instrument | Cash flow hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gain to be reclassified into interest expense within the next 12 months			$ 8,800,000
Interest Rate Swap And Interest Rate Cap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps liability	$ 0		0
Interest Rate Swap And Interest Rate Cap | Designated as hedging instrument | Cash flow hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate notional value	573,600,000		573,600,000		$ 574,800,000
Interest rate swap agreement asset	25,600,000		25,600,000		$ 17,900,000
Net unrealized gains on valuation of interest rate swap agreements	$ 7,300,000	$ 21,000,000	$ 10,600,000	$ 46,800,000