Variable Interest Entity (Details) - USD ($)		3 Months Ended		9 Months Ended
	Oct. 30, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]
Equity method investments		$ 526,900,000	$ 537,600,000	$ 526,900,000	$ 537,600,000	$ 534,400,000
Non-controlling interests		134,700,000		134,700,000		136,900,000
Statement of operations
Income from equity method investments		27,600,000	30,100,000	85,700,000	83,300,000
Less: Net income attributable to non-controlling interests		4,400,000	4,700,000	15,000,000.0	13,000,000.0
Net income attributable to the Partnership		$ 45,300,000	45,700,000	127,600,000	120,200,000
Cash flows from operating activities
Distributions of earnings received from equity method investments				85,800,000	86,500,000
Cash flows from financing activities
Distributions to non-controlling interests				$ (17,200,000)	(15,900,000)
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%		65.00%
Mardi Gras Transportation System Company LLC | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets of VIE		$ 0		$ 0		0
Balance Sheet Related Disclosures [Abstract]
Equity method investments		384,900,000		384,900,000		391,300,000
Non-controlling interests		134,700,000		134,700,000		$ 136,900,000
Statement of operations
Income from equity method investments		12,600,000	13,400,000	42,900,000	37,100,000
Less: Net income attributable to non-controlling interests		4,400,000	4,700,000	15,000,000.0	13,000,000.0
Net income attributable to the Partnership		$ 8,200,000	$ 8,700,000	27,900,000	24,100,000
Cash flows from operating activities
Distributions of earnings received from equity method investments				41,900,000	37,000,000.0
Cash flows from investing activities
Distribution in excess of earnings from equity method investments				7,400,000	8,300,000
Cash flows from financing activities
Distributions to non-controlling interests				(17,200,000)	(15,900,000)
Net change in cash and cash equivalents				$ 32,100,000	$ 29,400,000