Employee Benefit Obligations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Employee Benefit Obligations
Underfunded defined benefit pension liabilities, net	$ 706.3		$ 706.3		$ 724.1
Less current portion and prepaid pension assets	(17.4)		(17.4)		(19.4)
Long-term defined benefit pension liability	688.9		688.9		704.7
Retiree medical and other postemployment benefits	170.3		170.3		169.0
Deferred compensation plans	277.6		277.6		272.2
Other	29.7		29.7		32.4
Employee benefit obligations	1,166.5		1,166.5		1,178.3
Defined Benefit Pension Plans
Employee Benefit Obligations
Net periodic benefit cost for multiemployer plans	0.5	$ 0.6	1.0	$ 1.3
Total net periodic benefit cost	23.0	22.1	46.3	44.2
Ball-sponsored plans:
Service cost	16.8	15.0	33.5	29.9
Interest cost	18.7	22.2	37.7	44.3
Expected return on plan assets	(24.7)	(24.2)	(49.5)	(48.2)
Amortization of prior service cost	(0.3)	(0.1)	(0.7)	(0.2)
Recognized net actuarial loss	12.0	8.6	24.3	17.1
Net periodic benefit cost for Ball-sponsored plans	22.5	21.5	45.3	42.9
Defined Benefit Pension Plans | Funded plans
Ball-sponsored plans:
Contributions to pension plans					$ 36.8
Defined Benefit Pension Plans | Unfunded German plans
Employee Benefit Obligations
Expected benefit payments to plan participants for the full year	19.0		19.0
Ball-sponsored plans:
Contributions to pension plans			9.1
U.S.
Employee Benefit Obligations
Net periodic benefit cost for multiemployer plans	0.5	0.6	1.0	1.3
Total net periodic benefit cost	17.5	14.3	35.0	28.7
Ball-sponsored plans:
Service cost	13.0	11.4	26.0	22.8
Interest cost	14.2	15.6	28.5	31.2
Expected return on plan assets	(19.8)	(20.5)	(39.6)	(41.0)
Amortization of prior service cost	(0.2)		(0.5)
Recognized net actuarial loss	9.8	7.2	19.6	14.4
Net periodic benefit cost for Ball-sponsored plans	17.0	13.7	34.0	27.4
Foreign
Employee Benefit Obligations
Total net periodic benefit cost	5.5	7.8	11.3	15.5
Ball-sponsored plans:
Service cost	3.8	3.6	7.5	7.1
Interest cost	4.5	6.6	9.2	13.1
Expected return on plan assets	(4.9)	(3.7)	(9.9)	(7.2)
Amortization of prior service cost	(0.1)	(0.1)	(0.2)	(0.2)
Recognized net actuarial loss	2.2	1.4	4.7	2.7
Net periodic benefit cost for Ball-sponsored plans	$ 5.5	$ 7.8	$ 11.3	$ 15.5