Restructuring Plans (Schedule of Restructuring Reserve by Segment) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) business_line	Jun. 30, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	$ 5.2	$ 4.9	$ 13.4	$ 10.5
Cumulative	61.8		61.8
Expected Total	69.5		69.5
Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	3.2		8.5
Cumulative	45.1		45.1
Expected Total	52.2		52.2
Property Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.3		1.8
Cumulative	5.8		5.8
Expected Total	6.3		6.3
Other
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	1.7		3.1
Cumulative	10.9		10.9
Expected Total	11.0		$ 11.0
Gaming
Restructuring Cost and Reserve [Line Items]
Number of immaterial business lines with exit costs | business_line			2
Business Segment
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	3.0	3.0	$ 8.1	8.6
Business Segment | Gaming
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	2.7		6.9
Cumulative	29.0		29.0
Expected Total	36.6		36.6
Business Segment | Gaming | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	2.6		6.8
Cumulative	25.1		25.1
Expected Total	32.2		32.2
Business Segment | Gaming | Property Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.0		0.0
Cumulative	0.9		0.9
Expected Total	1.4		1.4
Business Segment | Gaming | Other
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.1		0.1
Cumulative	3.0		3.0
Expected Total	3.0		3.0
Business Segment | Lottery
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.0	$ 0.8	0.2	$ 1.2
Cumulative	3.7		3.7
Expected Total	3.7		3.7
Business Segment | Lottery | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.0		0.2
Cumulative	3.3		3.3
Expected Total	3.3		3.3
Business Segment | Lottery | Property Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.0		0.0
Cumulative	0.4		0.4
Expected Total	0.4		0.4
Business Segment | Lottery | Other
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.0		0.0
Cumulative	0.0		0.0
Expected Total	0.0		0.0
Business Segment | Interactive (1)
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.3		1.0
Cumulative	10.1		10.1
Expected Total	10.1		10.1
Business Segment | Interactive (1) | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.3		0.9
Cumulative	4.7		4.7
Expected Total	4.7		4.7
Business Segment | Interactive (1) | Property Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.0		0.0
Cumulative	0.4		0.4
Expected Total	0.4		0.4
Business Segment | Interactive (1) | Other
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.0		0.1
Cumulative	5.0		5.0
Expected Total	5.0		5.0
Unallocated corporate
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	2.2		5.3
Cumulative	19.0		19.0
Expected Total	19.1		19.1
Unallocated corporate | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.3		0.6
Cumulative	12.0		12.0
Expected Total	12.0		12.0
Unallocated corporate | Property Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.3		1.8
Cumulative	4.1		4.1
Expected Total	4.1		4.1
Unallocated corporate | Other
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	1.6		2.9
Cumulative	2.9		2.9
Expected Total	$ 3.0		$ 3.0