Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Fair value measurements, recurring

			Fair Value Measurements Using:
	Total Fair Value		Level 1		Level 2		Level 3
	(in millions)
As of December 31, 2012
Liabilities:
Deferred compensation	$	1.0	$	1.0	$	—	$	—
As of December 31, 2011
Liabilities:
Deferred compensation	$	1.3	$	1.3	$	—	$	—

Fair value measurements, nonrecurring

					Fair Value Measurements Using:
	Total Carrying Value		Total Fair Value		Level 1		Level 2		Level 3
			(in millions)
As of December 31, 2012
Assets:
Held-to-maturity securities	$	14.4	$	14.4	$	—	$	14.4	$	—
Promissory notes	$	4.0	$	4.0	$	—	$	4.0	$	—
Liabilities:
Long-term debt	$	1,440.5	$	1,532.1	$	—	$	1,532.1	$	—
As of December 31, 2011
Assets:
Held-to-maturity securities	$	4.6	$	4.6	$	—	$	4.6	$	—
Promissory notes	$	—	$	—	$	—	$	—	$	—
Liabilities:
Long-term debt	$	1,224.0	$	1,243.5	$	—	$	1,243.5	$	—

Depreciation Expense

	For the year ended December 31,
	2012		2011		2010
	(in millions)
Depreciation expense	$	115.5	$	103.7	$	109.6

Estimated Useful Lives

	Years
Land improvements	5 to 20
Buildings and improvements	15 to 35
Vessels	10 to 25
Furniture, fixtures and equipment	3 to 20

Complimentary Revenues

	For the year ended December 31,
	2012		2011		2010
	(in millions)
Complimentary revenues	$	110.4	$	105.6	$	101.2
Promotional allowance costs	$	83.9	$	81.3	$	78.3

Gaming Taxes

	For the year ended December 31,
	2012		2011		2010
	(in millions)
Gaming taxes	$	308.1	$	297.6	$	281.5

Advertising Costs

	For the year ended December 31,
	2012		2011		2010
	(in millions)
Advertising costs	$	26.6	$	23.2	$	24.6

Pre-opening and Development Costs

	For the year ended December 31,
	2012		2011		2010
	(in millions)
L'Auberge Baton Rouge	$	16.0	$	4.3	$	1.2
River City	0.1		0.2		9.9
Other	5.5		4.3		2.5
Total pre-opening and development costs	$	21.6	$	8.8	$	13.6