Selected Quarterly Financial Data, Unaudited (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Total revenue	$ 823.0	$ 768.9	$ 766.3	$ 725.4	$ 752.2	$ 720.0	$ 729.2	$ 682.0	$ 3,083.6	$ 2,883.4	$ 2,758.8
Cost of revenues	314.9	290.8	278.9	280.0	299.5	274.3	276.2	256.3	1,164.6	1,106.3	1,104.1
Selling, general and administrative	167.7	158.8	145.9	140.7	137.0	152.8	144.9	142.3	613.1	577.0	567.7
Research and development	45.8	47.8	48.1	42.4	49.4	53.9	51.7	49.8	184.1	204.8	183.9
Restructuring and other	27.8	7.8	1.1	9.2	36.3	13.8	4.2	2.7	45.9	57.0	21.9
Depreciation, amortization and impairments	169.6	173.1	175.0	165.1	173.3	191.7	193.1	180.6	682.8	738.7	903.2
Goodwill impairment					69.0	0.0	0.0	0.0	0.0	69.0	1,002.6
Operating income (loss)	97.2	90.6	117.3	88.0	(12.3)	33.5	59.1	50.3	393.1	130.6	(1,024.6)
Net loss	$ (43.1)	$ (59.3)	$ (39.1)	$ (100.8)	$ (110.8)	$ (98.9)	$ (51.7)	$ (92.3)	$ (242.3)	$ (353.7)	$ (1,394.3)
Basic and diluted net loss per share (in dollars per share)	$ (0.48)	$ (0.66)	$ (0.44)	$ (1.14)	$ (1.26)	$ (1.13)	$ (0.59)	$ (1.07)
Weighted average number of shares used in per share calculations:
Basic shares (in shares)	89.7	89.6	89.1	88.2	87.7	87.5	87.3	86.6	89.1	87.3	85.9
Diluted shares (in shares)	89.7	89.6	89.1	88.2	87.7	87.5	87.3	86.6	89.1	87.3	85.9
Gain (loss) on early extinguishment of long-term debt							$ 25.2
Insurance proceeds from legal settlement							$ 7.5
Income tax benefit									$ (14.5)	$ 125.0	$ 299.9
November 2016 Plan
Business Acquisition [Line Items]
Restructuring and other					$ 22.4				2.2	0.0
Lottery
Business Acquisition [Line Items]
Total revenue									$ 811.5	777.9	$ 775.2
Goodwill impairment					69.0					$ 69.0
Weighted average number of shares used in per share calculations:
Income tax benefit					$ 14.5
Senior Secured Term Loan B-3, maturing 2021
Weighted average number of shares used in per share calculations:
Gain (loss) on early extinguishment of long-term debt				$ (29.7)
Senior Secured Term Loan B-4, maturing 2024
Weighted average number of shares used in per share calculations:
Gain (loss) on early extinguishment of long-term debt		$ (8.4)