Discontinued Operations - Major Classes of Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Current assets of discontinued operations held for sale	$ 69.1	$ 70.8
Long-term assets of discontinued operations held for sale	823.4	823.3
Current liabilities:
Current liabilities of discontinued operations held for sale	188.2	207.6
Non-current liabilities of discontinued operations held for sale	54.8	92.3
Big Fish Games | Discontinued Operations, Held-for-sale
Current assets:
Cash and cash equivalents	2.6	3.4
Accounts receivable	42.9	24.7
Game software development, net	6.9	9.6
Other current assets	16.7	33.1
Current assets of discontinued operations held for sale	69.1	70.8
Property and equipment, net	16.4	13.8
Game software development, net	13.5	6.3
Goodwill	530.7	530.7
Other intangible assets, net	238.8	271.7
Other assets	24.0	0.8
Long-term assets of discontinued operations held for sale	823.4	823.3
Total assets	892.5	894.1
Current liabilities:
Accounts payable	5.5	3.7
Accrued expense	35.0	26.9
Deferred revenue	85.1	81.3
Big Fish Games deferred payment	28.4	27.8
Big Fish Games earnout liability	34.2	67.9
Current liabilities of discontinued operations held for sale	188.2	207.6
Deferred income taxes	47.6	90.0
Other liabilities	7.2	2.3
Non-current liabilities of discontinued operations held for sale	54.8	92.3
Total liabilities	$ 243.0	$ 299.9