Variable Interest Entity (Details) - USD ($)		3 Months Ended
	Oct. 30, 2017	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Equity method investments		$ 520,000,000.0	$ 531,500,000	$ 519,900,000
Non-controlling interests		131,900,000		132,500,000
Statement of operations
Income from equity method investments		30,300,000	31,300,000
Less: Net income attributable to non-controlling interests		5,800,000	5,800,000
Net income attributable to the Partnership		42,000,000.0	41,700,000
Cash flows from operating activities
Distributions of earnings received from equity method investments		28,300,000	31,400,000
Cash flows from financing activities
Distributions to non-controlling interests		$ (6,400,000)	(6,700,000)
Mardi Gras Transportation System Company LLC | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Managing member interest (as a percent)	100.00%
Remainder of economic interest held by affiliate (as a percent)	1.00%
Mardi Gras Transportation System Company LLC
Cash flows from financing activities
Equity Method Investment, Ownership Percentage		65.00%
Mardi Gras Transportation System Company LLC | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets of VIE		$ 0		0
Balance Sheet Related Disclosures [Abstract]
Equity method investments		376,700,000		378,500,000
Non-controlling interests		131,900,000		$ 132,500,000
Statement of operations
Income from equity method investments		16,400,000	16,600,000
Less: Net income attributable to non-controlling interests		5,800,000	5,800,000
Net income attributable to the Partnership		10,600,000	10,800,000
Cash flows from operating activities
Distributions of earnings received from equity method investments		16,500,000	16,400,000
Cash flows from investing activities
Distribution in excess of earnings from equity method investments		1,700,000	2,800,000
Cash flows from financing activities
Distributions to non-controlling interests		(6,400,000)	(6,700,000)
Net change in cash and cash equivalents		$ 11,800,000	$ 12,500,000