Restructuring and other - Restructuring and Other, By Segment (Details) - USD ($) $ 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
Restructuring Cost and Reserve [Line Items]
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
Unallocated and Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and other									30.1	32.1	9.0
Gaming | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other									7.7	14.6	11.2
Lottery | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other									5.9	8.7	0.2
Interactive | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other									2.2	1.6	$ 1.5
November 2016 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and other					$ 22.4				2.2	0.0
November 2016 Plan | Unallocated and Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and other									0.8	0.0
November 2016 Plan | Gaming | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other									1.1	0.0
November 2016 Plan | Lottery | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other									0.2	0.0
November 2016 Plan | Interactive | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring and other									$ 0.1	$ 0.0