Selected Quarterly Financial Data, Unaudited (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended								12 Months Ended
	Aug. 31, 2015	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Total revenue		$ 752.2	$ 720.0	$ 729.2	$ 682.0	$ 737.0	$ 671.6	$ 691.5	$ 658.7	$ 2,883.4	$ 2,758.8	$ 1,786.4
Cost of revenues		299.5	274.3	276.2	256.3	323.4	250.0	275.3	255.4	1,106.3	1,104.1	849.4
Selling, general and administrative		137.0	152.8	144.9	142.3	144.1	136.8	140.9	145.9	577.0	567.7	507.7
Research and development		49.4	53.9	51.7	49.8	43.1	45.9	48.0	46.9	204.8	183.9	117.0
Depreciation, amortization and impairments		173.3	191.7	193.1	180.6	210.3	286.5	222.2	184.2	738.7	903.2	454.3
Restructuring and other		36.3	13.8	4.2	2.7	2.9	5.6	5.2	8.2	57.0	21.9	30.7
Goodwill impairments		69.0	0.0	0.0	0.0	67.6	935.0	0.0	0.0	69.0	1,002.6	0.0
Operating income (loss)		(12.3)	33.5	59.1	50.3	(54.4)	(988.2)	(0.1)	18.1	130.6	(1,024.6)	(172.7)
Net loss		$ (110.8)	$ (98.9)	$ (51.7)	$ (92.3)	$ (127.5)	$ (1,078.2)	$ (102.2)	$ (86.4)	$ (353.7)	$ (1,394.3)	$ (234.3)
Basic and diluted net loss per share (in dollars per share)		$ (1.26)	$ (1.13)	$ (0.59)	$ (1.07)	$ (1.48)	$ (12.52)	$ (1.19)	$ (1.01)
Weighted average number of shares used in per share calculations:
Basic shares (in shares)		87.7	87.5	87.3	86.6	86.3	86.1	85.9	85.3	87.3	85.9	84.6
Diluted shares (in shares)		87.7	87.5	87.3	86.6	86.3	86.1	85.9	85.3	87.3	85.9	84.6
Loss on early extinguishment of long-term debt								$ 5.9
Insurance proceeds from legal settlement				$ 7.5
Other asset impairment charges		$ 22.4
Employee severance
Business Acquisition [Line Items]
Restructuring and other						$ 26.4				$ 36.2	$ 16.9	$ 25.8
Bally Technologies Inc.
Business Acquisition [Line Items]
Total revenue							$ 935.0
Cost of revenues							$ 103.6
Selling, general and administrative						67.6
Research and development						24.9
Depreciation, amortization and impairments						35.5
Restructuring and other						$ 2.5
Sportech
Weighted average number of shares used in per share calculations:
Acquisition-related costs expensed									$ 4.6
Northstar IL
Weighted average number of shares used in per share calculations:
Shortfall payment	$ 10.0							35.1
Investee estimated shortfall payment								$ 25.0
Lottery
Business Acquisition [Line Items]
Total revenue										777.9	775.2	$ 835.5
Goodwill impairments										$ 69.0	$ 67.6
Weighted average number of shares used in per share calculations:
Asset impairment charge		69.0
Asset impairment charge, net of tax		$ 14.5
Senior Subordinate Notes, Maturing 2020 and 2021 | Senior Subordinated Notes
Weighted average number of shares used in per share calculations:
Loss on early extinguishment of long-term debt				$ 25.2