Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries - Statement of Operations and Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Condensed Financial Statements
Revenue	$ 720.0	$ 671.6	$ 2,131.2	$ 2,021.8
Cost of services, cost of product sales and cost of instant games	274.3	250.0	806.8	780.7
Selling, general and administrative	152.8	136.8	440.0	423.6
Research and development	53.9	45.9	155.4	140.8
Restructuring and other	13.8	5.6	20.7	19.0
Depreciation, amortization and impairments	191.7	286.5	565.4	692.9
Goodwill impairment	0.0	935.0	0.0	935.0
Operating (loss) income	33.5	(988.2)	142.9	(970.2)
Interest expense	(165.4)	(166.8)	(496.4)	(497.5)
Gain on early extinguishment of debt	0.0	0.0	25.2	0.0
Other (expense) income, net	13.3	(4.5)	26.9	(8.0)
Net (loss) income before equity in income of subsidiaries and income taxes	(118.6)	(1,159.5)	(301.4)	(1,475.7)
Equity in income of subsidiaries	0.0	0.0	0.0	0.0
Income tax (expense) benefit	19.7	81.3	58.5	208.9
Net (loss) income	(98.9)	(1,078.2)	(242.9)	(1,266.8)
Other comprehensive income (loss)	5.2	(49.0)	(27.4)	(136.1)
Comprehensive (loss) income	(93.7)	(1,127.2)	(270.3)	(1,402.9)
Reportable Legal Entities | SGC (Parent and Issuer)
Condensed Financial Statements
Revenue	0.0	0.0	0.0	0.0
Cost of services, cost of product sales and cost of instant games	0.0	0.0	0.0	0.0
Selling, general and administrative	30.9	16.2	91.9	47.8
Research and development	2.1	0.0	4.8	0.0
Restructuring and other	14.3	1.4	14.3	4.6
Depreciation, amortization and impairments	13.8	8.3	39.5	24.3
Goodwill impairment		0.0		0.0
Operating (loss) income	(61.1)	(25.9)	(150.5)	(76.7)
Interest expense	(5.3)	(5.2)	(15.8)	(15.8)
Gain on early extinguishment of debt			0.0
Other (expense) income, net	(13.9)	6.9	(64.2)	24.9
Net (loss) income before equity in income of subsidiaries and income taxes	(80.3)	(24.2)	(230.5)	(67.6)
Equity in income of subsidiaries	18.1	(1,137.5)	(22.7)	(1,412.1)
Income tax (expense) benefit	(36.7)	83.5	10.3	212.9
Net (loss) income	(98.9)	(1,078.2)	(242.9)	(1,266.8)
Other comprehensive income (loss)	5.2	(49.0)	(27.4)	(136.1)
Comprehensive (loss) income	(93.7)	(1,127.2)	(270.3)	(1,402.9)
Reportable Legal Entities | SGI (Issuer)
Condensed Financial Statements
Revenue	114.2	106.5	355.8	324.1
Cost of services, cost of product sales and cost of instant games	81.8	77.7	250.8	238.0
Selling, general and administrative	14.8	15.9	37.6	50.5
Research and development	1.6	0.8	6.3	3.6
Restructuring and other	0.2	0.6	0.4	1.5
Depreciation, amortization and impairments	8.7	10.5	29.9	30.1
Goodwill impairment		0.0		0.0
Operating (loss) income	7.1	1.0	30.8	0.4
Interest expense	(159.5)	(161.4)	(480.0)	(481.3)
Gain on early extinguishment of debt			25.2
Other (expense) income, net	54.7	19.3	157.5	55.2
Net (loss) income before equity in income of subsidiaries and income taxes	(97.7)	(141.1)	(266.5)	(425.7)
Equity in income of subsidiaries	7.5	11.8	37.8	41.1
Income tax (expense) benefit	99.2	(0.1)	99.2	(0.2)
Net (loss) income	9.0	(129.4)	(129.5)	(384.8)
Other comprehensive income (loss)	2.1	(3.1)	5.0	(12.9)
Comprehensive (loss) income	11.1	(132.5)	(124.5)	(397.7)
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Financial Statements
Revenue	330.8	370.7	1,047.0	1,163.3
Cost of services, cost of product sales and cost of instant games	86.1	113.1	275.2	371.4
Selling, general and administrative	43.1	59.2	132.8	186.9
Research and development	38.3	35.4	109.1	108.5
Restructuring and other	(0.7)	2.9	3.3	9.6
Depreciation, amortization and impairments	140.6	232.2	407.3	528.2
Goodwill impairment		802.9		802.9
Operating (loss) income	23.4	(875.0)	119.3	(844.2)
Interest expense	0.0	0.0	0.0	0.0
Gain on early extinguishment of debt			0.0
Other (expense) income, net	(26.7)	(8.2)	(73.9)	(77.0)
Net (loss) income before equity in income of subsidiaries and income taxes	(3.3)	(883.2)	45.4	(921.2)
Equity in income of subsidiaries	37.9	(143.6)	85.3	(112.6)
Income tax (expense) benefit	(16.9)	(0.9)	(16.8)	(7.0)
Net (loss) income	17.7	(1,027.7)	113.9	(1,040.8)
Other comprehensive income (loss)	(48.0)	56.8	(54.2)	48.4
Comprehensive (loss) income	(30.3)	(970.9)	59.7	(992.4)
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements
Revenue	358.4	270.4	942.2	811.0
Cost of services, cost of product sales and cost of instant games	189.8	135.2	494.6	447.9
Selling, general and administrative	64.0	45.5	177.7	138.4
Research and development	11.9	9.7	35.2	28.7
Restructuring and other	0.0	0.7	2.7	3.3
Depreciation, amortization and impairments	28.6	35.5	88.7	110.3
Goodwill impairment		132.1		132.1
Operating (loss) income	64.1	(88.3)	143.3	(49.7)
Interest expense	(0.6)	(0.2)	(0.6)	(0.4)
Gain on early extinguishment of debt			0.0
Other (expense) income, net	(0.8)	(22.5)	7.5	(11.1)
Net (loss) income before equity in income of subsidiaries and income taxes	62.7	(111.0)	150.2	(61.2)
Equity in income of subsidiaries	0.0	0.0	0.0	0.0
Income tax (expense) benefit	(25.9)	(1.2)	(34.2)	3.2
Net (loss) income	36.8	(112.2)	116.0	(58.0)
Other comprehensive income (loss)	19.0	(104.1)	(11.8)	(181.4)
Comprehensive (loss) income	55.8	(216.3)	104.2	(239.4)
Eliminating Entries
Condensed Financial Statements
Revenue	(83.4)	(76.0)	(213.8)	(276.6)
Cost of services, cost of product sales and cost of instant games	(83.4)	(76.0)	(213.8)	(276.6)
Selling, general and administrative	0.0	0.0	0.0	0.0
Research and development	0.0	0.0	0.0	0.0
Restructuring and other	0.0	0.0	0.0	0.0
Depreciation, amortization and impairments	0.0	0.0	0.0	0.0
Goodwill impairment		0.0		0.0
Operating (loss) income	0.0	0.0	0.0	0.0
Interest expense	0.0	0.0	0.0	0.0
Gain on early extinguishment of debt			0.0
Other (expense) income, net	0.0	0.0	0.0	0.0
Net (loss) income before equity in income of subsidiaries and income taxes	0.0	0.0	0.0	0.0
Equity in income of subsidiaries	(63.5)	1,269.3	(100.4)	1,483.6
Income tax (expense) benefit	0.0	0.0	0.0	0.0
Net (loss) income	(63.5)	1,269.3	(100.4)	1,483.6
Other comprehensive income (loss)	26.9	50.4	61.0	145.9
Comprehensive (loss) income	$ (36.6)	$ 1,319.7	$ (39.4)	$ 1,629.5