Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

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, 2013
Liabilities:
Deferred compensation	$	0.8	$	0.8	$	—	$	—
As of December 31, 2012
Liabilities:
Deferred compensation	$	1.0	$	1.0	$	—	$	—

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, 2013
Assets:
Held-to-maturity securities	$	14.8	$	30.1	$	—	$	26.7	$	3.4
Promissory notes	$	9.5	$	16.5	$	—	$	16.5	$	—
Liabilities:
Long-term debt	$	4,380.1	$	4,511.9	$	—	$	4,511.9	$	—
As of December 31, 2012
Assets:
Held-to-maturity securities	$	14.4	$	14.4	$	—	$	9.9	$	4.5
Promissory notes	$	4.0	$	4.0	$	—	$	4.0	$	—
Liabilities:
Long-term debt	$	1,440.5	$	1,532.1	$	—	$	1,532.1	$	—

Depreciation Expense

	For the year ended December 31,
	2013		2012		2011
	(in millions)
Depreciation expense	$	139.1	$	82.5	$	70.1

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,
	2013		2012		2011
	(in millions)
Food and beverage	$	94.7	$	58.1	$	55.8
Lodging	49.3		28.1		27.4
Other	13.4		9.6		8.4
Total promotional allowances	$	157.4	$	95.8	$	91.6

The cost to provide such complimentary benefits for the years ended December 31, 2013, 2012 and 2011 were as follows:

	For the year ended December 31,
	2013		2012		2011
	(in millions)
Promotional allowance costs included in gaming expense	$	111.2	$	72.4	$	69.7

Gaming Taxes

	For the year ended December 31,
	2013		2012		2011
	(in millions)
Gaming taxes	$	378.6	$	261.8	$	247.7

Advertising Costs

	For the year ended December 31,
	2013		2012		2011
	(in millions)
Advertising costs	$	20.9	$	22.1	$	17.1

Pre-opening and Development Costs

	For the year ended December 31,
	2013		2012		2011
	(in millions)
Ameristar acquisition	$	85.3	$	—	$	—
Other	3.7		21.5		8.8
Total pre-opening and development costs	$	89.0	$	21.5	$	8.8