Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 140.5	$ 108.1	$ 65.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	97.1	108.6	109.7
Game software development amortization	17.5	17.2	9.7
Acquisition expenses, net	3.9	3.4	34.7
Gain on sale of equity investments	0.0	0.0	(5.8)
Earnings from equity investments, net	(25.5)	(17.4)	(11.2)
Distributed earnings from equity investments	18.0	15.6	15.2
Stock-based compensation	27.1	18.9	13.8
Deferred income taxes	(65.0)	35.4	(3.4)
Impairment of tangible and other intangible assets	21.7	0.0	0.0
Loss on extinguishment of debt	20.7	0.0	0.0
(Gain) loss on sale of assets	0.1	(23.6)	0.3
Big Fish Games earnout payment	(2.4)	(19.7)	0.0
Big Fish Games deferred payment	0.0	(2.0)	0.0
Other	1.7	2.0	4.6
Increase (decrease) in cash resulting from changes in operating assets and liabilities, net of business acquisitions:
Other current assets and liabilities	(10.4)	(10.2)	(15.3)
Game software development	(22.1)	(22.1)	(19.8)
Income taxes	(27.4)	(6.6)	28.5
Deferred revenue	17.2	17.9	38.3
Other assets and liabilities	5.5	1.3	0.0
Net cash provided by operating activities	218.2	226.8	264.5
Cash flows from investing activities:
Capital maintenance expenditures	(33.3)	(30.9)	(31.1)
Capital project expenditures	(83.6)	(23.8)	(12.4)
Receivable from escrow	13.6	(13.6)	0.0
Acquisition of businesses, net of cash acquired	(24.2)	0.0	(0.9)
Investment in joint ventures	(24.0)	(8.0)	(25.0)
Proceeds from sale of assets	0.0	25.6	0.2
Other	(2.1)	0.0	3.7
Net cash used in investing activities	(153.6)	(50.7)	(65.5)
Cash flows from financing activities:
Proceeds from borrowings under long-term debt obligations	2,050.4	727.1	1,004.2
Repayments of borrowings under long-term debt obligations	(1,835.8)	(588.4)	(985.8)
Call premium on 2021 Senior Notes	(16.1)	0.0	0.0
Debt issuance costs	(14.4)	(1.4)	(4.6)
Repurchase of common stock	(190.9)	(39.0)	(147.6)
Payment of dividends	(21.5)	(19.1)	(17.4)
Common stock issued	2.1	2.2	1.2
Big Fish Games earnout payment	(31.8)	(261.9)	0.0
Big Fish Games deferred payment	0.0	(26.4)	(28.5)
Tax refund payments to Big Fish Games equity holders	0.0	(0.4)	(17.7)
Other	(1.5)	5.4	5.6
Net cash used in financing activities	(59.5)	(201.9)	(190.6)
Net increase (decrease) in cash and cash equivalents	5.1	(25.8)	8.4
Effect of exchange rate changes on cash	0.5	0.0	(1.8)
Cash and cash equivalents, beginning of year	48.7	74.5	67.9
Cash and cash equivalents, end of year	54.3	48.7	74.5
Supplemental disclosures of cash flow information:
Interest	47.7	40.0	25.2
Income taxes	75.9	32.4	41.5
Schedule of non-cash investing and financing activities:
Dividends payable	23.7	21.8	19.1
Property and equipment additions included in accounts payable and accrued expense	9.6	4.2	1.5
Repurchase of common stock in payment of income taxes on stock-based compensation included in accrued expense	$ 1.3	$ 6.4	$ 3.6