Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries - Supplemental Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	$ 419.0	$ 414.2	$ 203.5
Cash flows from investing activities:
Capital expenditures	(272.9)	(323.6)	(238.3)
Additions to equity method investments	(1.2)	(2.7)	(48.2)
Proceeds from sale of equity interest	0.0	0.0	44.9
Distributions of capital from equity investments	25.3	38.7	48.8
Restricted cash	(3.7)	5.9	(0.4)
Proceeds from asset sales	16.7	6.7	0.5
Business acquisitions, net of cash acquired	0.0	0.0	(3,140.6)
Changes in other assets and liabilities and other	19.6	8.5	0.9
Other, principally change in intercompany investing activities	0.0	0.0	0.0
Net cash (used in) provided by investing activities	(231.7)	(263.8)	(3,332.9)
Cash flows from financing activities:
Net payments of long-term debt	(139.7)	(141.3)	3,395.2
Payments of deferred financing fees	0.0	0.0	(163.1)
Net (redemptions) issuances of common stock under stock-based compensation plans	(6.1)	(0.9)	(18.4)
Common stock repurchases	0.0	0.0	(29.5)
Contingent earnout payments	0.0	(0.5)	(13.2)
Payments on license obligations	(50.2)	(40.5)	(13.6)
Other, principally change in intercompany financing activities	0.0	0.0	0.0
Net cash (used in) provided by financing activities	(196.0)	(183.2)	3,157.4
Effect of exchange rate changes on cash and cash equivalents	(4.9)	(10.3)	(9.9)
(Decrease) increase in cash and cash equivalents	(13.6)	(43.1)	18.1
Cash and cash equivalents, beginning of period	128.7	171.8	153.7
Cash and cash equivalents, end of period	115.1	128.7	171.8
Reportable Legal Entities | Parent Company
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(90.4)	(112.2)	92.2
Cash flows from investing activities:
Capital expenditures	(39.1)	(36.6)	(12.9)
Additions to equity method investments			0.0
Proceeds from sale of equity interest			0.0
Distributions of capital from equity investments	0.0	0.0	0.0
Restricted cash	0.0	0.0	0.0
Proceeds from asset sales		0.0
Business acquisitions, net of cash acquired			0.0
Changes in other assets and liabilities and other	0.0	0.0	(3,210.2)
Other, principally change in intercompany investing activities	0.0	0.0	0.0
Net cash (used in) provided by investing activities	(39.1)	(36.6)	(3,223.1)
Cash flows from financing activities:
Net payments of long-term debt	0.0	0.0	0.0
Payments of deferred financing fees			0.0
Net (redemptions) issuances of common stock under stock-based compensation plans	(6.1)	(0.8)	(18.7)
Common stock repurchases			(29.5)
Contingent earnout payments		0.0	0.0
Payments on license obligations	(38.0)	(26.0)	0.0
Other, principally change in intercompany financing activities	163.1	180.9	3,159.7
Net cash (used in) provided by financing activities	119.0	154.1	3,111.5
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0	0.0
(Decrease) increase in cash and cash equivalents	(10.5)	5.3	(19.4)
Cash and cash equivalents, beginning of period	43.2	37.9	57.3
Cash and cash equivalents, end of period	32.7	43.2	37.9
Reportable Legal Entities | SGI
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(259.8)	(350.3)	(103.3)
Cash flows from investing activities:
Capital expenditures	(22.8)	(24.0)	(30.1)
Additions to equity method investments			(7.6)
Proceeds from sale of equity interest			0.0
Distributions of capital from equity investments	0.0	1.0	1.6
Restricted cash	0.0	0.0	0.0
Proceeds from asset sales		0.0
Business acquisitions, net of cash acquired			0.0
Changes in other assets and liabilities and other	(1.2)	(2.9)	29.3
Other, principally change in intercompany investing activities	418.4	509.6	(5,016.5)
Net cash (used in) provided by investing activities	394.4	483.7	(5,023.3)
Cash flows from financing activities:
Net payments of long-term debt	(132.9)	(133.0)	5,289.2
Payments of deferred financing fees			(163.1)
Net (redemptions) issuances of common stock under stock-based compensation plans	0.0	0.0	0.0
Common stock repurchases			0.0
Contingent earnout payments		0.0	0.0
Payments on license obligations	0.0	0.0	0.0
Other, principally change in intercompany financing activities	0.0	0.0	0.0
Net cash (used in) provided by financing activities	(132.9)	(133.0)	5,126.1
Effect of exchange rate changes on cash and cash equivalents	0.0	(0.5)	0.6
(Decrease) increase in cash and cash equivalents	1.7	(0.1)	0.1
Cash and cash equivalents, beginning of period	0.0	0.1	0.0
Cash and cash equivalents, end of period	1.7	0.0	0.1
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	535.0	603.2	129.6
Cash flows from investing activities:
Capital expenditures	(149.5)	(225.8)	(156.2)
Additions to equity method investments			0.0
Proceeds from sale of equity interest			0.0
Distributions of capital from equity investments	0.0	0.0	0.0
Restricted cash	(3.6)	6.5	(0.4)
Proceeds from asset sales		6.9
Business acquisitions, net of cash acquired			(3,140.6)
Changes in other assets and liabilities and other	16.8	5.9	4.3
Other, principally change in intercompany investing activities	0.0	0.0	296.3
Net cash (used in) provided by investing activities	(136.3)	(206.5)	(2,996.6)
Cash flows from financing activities:
Net payments of long-term debt	0.0	0.0	(1,882.9)
Payments of deferred financing fees			0.0
Net (redemptions) issuances of common stock under stock-based compensation plans	0.0	(35.6)	3,196.3
Common stock repurchases			0.0
Contingent earnout payments		(0.5)	(3.0)
Payments on license obligations	(12.2)	(14.5)	(13.6)
Other, principally change in intercompany financing activities	(387.0)	(376.0)	1,571.1
Net cash (used in) provided by financing activities	(399.2)	(426.6)	2,867.9
Effect of exchange rate changes on cash and cash equivalents	0.0	3.1	0.4
(Decrease) increase in cash and cash equivalents	(0.5)	(26.8)	1.3
Cash and cash equivalents, beginning of period	0.5	27.3	26.0
Cash and cash equivalents, end of period	0.0	0.5	27.3
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	235.3	273.5	85.0
Cash flows from investing activities:
Capital expenditures	(61.5)	(37.2)	(39.1)
Additions to equity method investments			(40.6)
Proceeds from sale of equity interest			44.9
Distributions of capital from equity investments	25.3	37.7	47.2
Restricted cash	(0.1)	(0.6)	0.0
Proceeds from asset sales		(0.2)
Business acquisitions, net of cash acquired			0.0
Changes in other assets and liabilities and other	4.0	5.5	49.3
Other, principally change in intercompany investing activities	(194.5)	0.0	0.0
Net cash (used in) provided by investing activities	(226.8)	5.2	61.7
Cash flows from financing activities:
Net payments of long-term debt	(6.8)	(8.3)	(11.1)
Payments of deferred financing fees			0.0
Net (redemptions) issuances of common stock under stock-based compensation plans	0.0	23.7	(67.8)
Common stock repurchases			0.0
Contingent earnout payments		0.0	(10.2)
Payments on license obligations	0.0	0.0	0.0
Other, principally change in intercompany financing activities	0.0	(302.7)	(10.6)
Net cash (used in) provided by financing activities	(6.8)	(287.3)	(99.7)
Effect of exchange rate changes on cash and cash equivalents	(4.9)	(12.9)	(10.9)
(Decrease) increase in cash and cash equivalents	(3.2)	(21.5)	36.1
Cash and cash equivalents, beginning of period	85.0	106.5	70.4
Cash and cash equivalents, end of period	81.8	85.0	106.5
Eliminating Entries
Condensed Financial Statements, Captions [Line Items]
Net cash (used in) provided by operating activities	(1.1)	0.0	0.0
Cash flows from investing activities:
Capital expenditures	0.0	0.0	0.0
Additions to equity method investments			0.0
Proceeds from sale of equity interest			0.0
Distributions of capital from equity investments	0.0	0.0	0.0
Restricted cash	0.0	0.0	0.0
Proceeds from asset sales		0.0
Business acquisitions, net of cash acquired			0.0
Changes in other assets and liabilities and other	0.0	0.0	3,128.2
Other, principally change in intercompany investing activities	(223.9)	(509.6)	4,720.2
Net cash (used in) provided by investing activities	(223.9)	(509.6)	7,848.4
Cash flows from financing activities:
Net payments of long-term debt	0.0	0.0	0.0
Payments of deferred financing fees			0.0
Net (redemptions) issuances of common stock under stock-based compensation plans	0.0	11.8	(3,128.2)
Common stock repurchases			0.0
Contingent earnout payments		0.0	0.0
Payments on license obligations	0.0	0.0	0.0
Other, principally change in intercompany financing activities	223.9	497.8	(4,720.2)
Net cash (used in) provided by financing activities	223.9	509.6	(7,848.4)
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0	0.0
(Decrease) increase in cash and cash equivalents	(1.1)	0.0	0.0
Cash and cash equivalents, beginning of period	0.0	0.0	0.0
Cash and cash equivalents, end of period	$ (1.1)	$ 0.0	$ 0.0