Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries - Supplemental Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Condensed Financial Statements
Revenue	$ 844.7	$ 766.3	$ 1,656.5	$ 1,491.7
Cost of services, cost of product sales and cost of instant products	315.9	278.9	612.6	558.9
Selling, general and administrative	173.9	145.9	345.5	286.6
Research and development	49.2	48.1	103.0	90.5
Depreciation, amortization and impairments	172.7	175.0	360.8	340.1
Restructuring and other	33.5	1.1	85.7	10.3
Operating (loss) income	99.5	117.3	148.9	205.3
Interest expense	(146.1)	(151.2)	(300.9)	(310.6)
Loss on debt financing transactions	0.0	0.0	(93.2)	(29.7)
Gain on remeasurement of debt	34.5	0.0	33.4	0.0
Other income (expense), net	6.3	1.2	10.4	18.2
Net income (loss) before income taxes	(5.8)	(32.7)	(201.4)	(116.8)
Equity in (loss) income of subsidiaries	0.0	0.0	0.0	0.0
Income tax benefit (expense)	0.0	(6.4)	(6.2)	(23.1)
Net (loss) income	(5.8)	(39.1)	(207.6)	(139.9)
Other comprehensive (loss) income	(83.4)	31.7	(31.3)	67.8
Comprehensive (loss) income	(89.2)	(7.4)	(238.9)	(72.1)
Reportable Legal Entities | SGI (Issuer)
Condensed Financial Statements
Revenue	136.0	128.3	265.6	246.3
Cost of services, cost of product sales and cost of instant products	86.3	86.8	172.6	169.7
Selling, general and administrative	9.1	8.5	20.0	18.0
Research and development	0.5	2.4	0.9	3.8
Depreciation, amortization and impairments	7.4	8.0	15.0	15.5
Restructuring and other	(3.4)	0.3	(2.6)	0.5
Operating (loss) income	36.1	22.3	59.7	38.8
Interest expense	(146.1)	(151.1)	(300.5)	(305.7)
Loss on debt financing transactions			(93.2)	(28.6)
Gain on remeasurement of debt	34.5		33.4
Other income (expense), net	131.9	51.7	269.1	102.4
Net income (loss) before income taxes	56.4	(77.1)	(31.5)	(193.1)
Equity in (loss) income of subsidiaries	13.7	14.6	17.3	31.9
Income tax benefit (expense)	(25.7)	28.9	7.5	72.3
Net (loss) income	44.4	(33.6)	(6.7)	(88.9)
Other comprehensive (loss) income	29.3	0.3	12.2	4.3
Comprehensive (loss) income	73.7	(33.3)	5.5	(84.6)
Reportable Legal Entities | SGC (Parent)
Condensed Financial Statements
Revenue	0.0	0.0	0.0	0.0
Cost of services, cost of product sales and cost of instant products	0.0	0.0	0.0	0.0
Selling, general and administrative	43.3	29.2	81.1	58.9
Research and development	0.0	0.7	0.0	1.2
Depreciation, amortization and impairments	11.9	16.9	21.1	37.2
Restructuring and other	30.2	1.5	56.3	5.3
Operating (loss) income	(85.4)	(48.3)	(158.5)	(102.6)
Interest expense	0.0	0.2	0.0	(4.3)
Loss on debt financing transactions			0.0	(1.1)
Gain on remeasurement of debt	0.0		0.0
Other income (expense), net	16.9	(18.1)	32.5	(38.9)
Net income (loss) before income taxes	(68.5)	(66.2)	(126.0)	(146.9)
Equity in (loss) income of subsidiaries	25.8	18.8	(58.1)	23.5
Income tax benefit (expense)	36.9	8.3	(23.5)	(16.5)
Net (loss) income	(5.8)	(39.1)	(207.6)	(139.9)
Other comprehensive (loss) income	(83.4)	31.7	(31.3)	67.8
Comprehensive (loss) income	(89.2)	(7.4)	(238.9)	(72.1)
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Financial Statements
Revenue	404.4	420.5	791.3	820.3
Cost of services, cost of product sales and cost of instant products	131.4	129.0	249.8	252.7
Selling, general and administrative	51.5	68.9	108.9	117.7
Research and development	21.9	16.9	44.8	51.1
Depreciation, amortization and impairments	107.4	122.8	233.5	234.7
Restructuring and other	1.7	(1.1)	3.2	3.1
Operating (loss) income	90.5	84.0	151.1	161.0
Interest expense	0.0	0.0	0.0	0.0
Loss on debt financing transactions			0.0	0.0
Gain on remeasurement of debt	0.0		0.0
Other income (expense), net	(119.1)	(31.0)	(252.0)	(56.5)
Net income (loss) before income taxes	(28.6)	53.0	(100.9)	104.5
Equity in (loss) income of subsidiaries	(17.2)	6.1	(6.8)	21.5
Income tax benefit (expense)	(3.9)	(27.4)	21.4	(48.0)
Net (loss) income	(49.7)	31.7	(86.3)	78.0
Other comprehensive (loss) income	(35.8)	44.7	(13.4)	66.2
Comprehensive (loss) income	(85.5)	76.4	(99.7)	144.2
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements
Revenue	376.3	284.8	745.2	549.4
Cost of services, cost of product sales and cost of instant products	159.2	135.6	312.3	257.4
Selling, general and administrative	82.6	52.1	161.4	114.5
Research and development	26.8	28.1	57.3	34.4
Depreciation, amortization and impairments	49.5	29.6	97.9	57.4
Restructuring and other	5.0	0.4	28.8	1.4
Operating (loss) income	53.2	39.0	87.5	84.3
Interest expense	0.0	(0.3)	(0.4)	(0.6)
Loss on debt financing transactions			0.0	0.0
Gain on remeasurement of debt	0.0		0.0
Other income (expense), net	(23.4)	(1.4)	(39.2)	11.2
Net income (loss) before income taxes	29.8	37.3	47.9	94.9
Equity in (loss) income of subsidiaries	0.0	0.0	0.0	0.0
Income tax benefit (expense)	(7.3)	(16.2)	(11.6)	(30.9)
Net (loss) income	22.5	21.1	36.3	64.0
Other comprehensive (loss) income	(119.0)	30.2	(45.9)	59.7
Comprehensive (loss) income	(96.5)	51.3	(9.6)	123.7
Eliminating Entries
Condensed Financial Statements
Revenue	(72.0)	(67.3)	(145.6)	(124.3)
Cost of services, cost of product sales and cost of instant products	(61.0)	(72.5)	(122.1)	(120.9)
Selling, general and administrative	(12.6)	(12.8)	(25.9)	(22.5)
Research and development	0.0	0.0	0.0	0.0
Depreciation, amortization and impairments	(3.5)	(2.3)	(6.7)	(4.7)
Restructuring and other	0.0	0.0	0.0	0.0
Operating (loss) income	5.1	20.3	9.1	23.8
Interest expense	0.0	0.0	0.0	0.0
Loss on debt financing transactions			0.0	0.0
Gain on remeasurement of debt	0.0		0.0
Other income (expense), net	0.0	0.0	0.0	0.0
Net income (loss) before income taxes	5.1	20.3	9.1	23.8
Equity in (loss) income of subsidiaries	(22.3)	(39.5)	47.6	(76.9)
Income tax benefit (expense)	0.0	0.0	0.0	0.0
Net (loss) income	(17.2)	(19.2)	56.7	(53.1)
Other comprehensive (loss) income	125.5	(75.2)	47.1	(130.2)
Comprehensive (loss) income	$ 108.3	$ (94.4)	$ 103.8	$ (183.3)