Restructuring Plans (Schedule of Restructuring Reserve by Segment) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	$ 8.2	$ 5.6
Cumulative	56.6
Expected Total	68.8
Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	5.3
Cumulative	41.9
Expected Total	52.6
Property Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	1.5
Cumulative	5.5
Expected Total	5.5
Other
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	1.4
Cumulative	9.2
Expected Total	10.7
Gaming
Restructuring Cost and Reserve [Line Items]
Number of immaterial business lines with exit costs	2
Business Segment
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	5.1	5.6
Business Segment | Gaming
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	4.2
Cumulative	26.3
Expected Total	38.5
Business Segment | Gaming | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	4.2
Cumulative	22.5
Expected Total	33.2
Business Segment | Gaming | Property Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0
Cumulative	0.9
Expected Total	0.9
Business Segment | Gaming | Other
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0
Cumulative	2.9
Expected Total	4.4
Business Segment | Lottery
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.2	0.4
Cumulative	3.7
Expected Total	3.7
Business Segment | Lottery | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.2
Cumulative	3.3
Expected Total	3.3
Business Segment | Lottery | Property Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0
Cumulative	0.4
Expected Total	0.4
Business Segment | Lottery | Other
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0
Cumulative	0
Expected Total	0
Business Segment | Interactive (1)
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.7
Cumulative	9.8
Expected Total	9.8
Business Segment | Interactive (1) | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.6
Cumulative	4.4
Expected Total	4.4
Business Segment | Interactive (1) | Property Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0
Cumulative	0.4
Expected Total	0.4
Business Segment | Interactive (1) | Other
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.1
Cumulative	5.0
Expected Total	5.0
Unallocated corporate
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	3.1
Cumulative	16.8
Expected Total	16.8
Unallocated corporate | Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	0.3
Cumulative	11.7
Expected Total	11.7
Unallocated corporate | Property Costs
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	1.5
Cumulative	3.8
Expected Total	3.8
Unallocated corporate | Other
Restructuring Cost and Reserve [Line Items]
Employee termination and restructuring	1.3
Cumulative	1.3
Expected Total	$ 1.3