Selected Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended								12 Months Ended
	Nov. 30, 2015	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data [Abstract]
Revenues		$ 765.8	$ 759.2	$ 760.3	$ 776.1	$ 881.2	$ 872.5	$ 859.0	$ 949.6	$ 3,061.4	$ 3,562.3	$ 3,778.6
Operating Profit (Loss)		33.0	25.3	(14.6)	12.9	(23.7)	61.2	8.7	(73.7)	56.6	(27.5)	163.2
Amounts attributable to Brink’s:
Continuing operations		(3.2)	7.7	(13.0)	(0.6)	(25.5)	28.8	0.9	(59.0)	(9.1)	(54.8)	66.0
Discontinued operations		(0.4)	(0.1)	0.1	(2.4)	(21.7)	(8.6)	0.7	0.5	(2.8)	(29.1)	(9.2)
Net income (loss) attributable to Brink’s		(3.6)	7.6	(12.9)	(3.0)	(47.2)	20.2	1.6	(58.5)	(11.9)	(83.9)	56.8
Depreciation and amortization		33.6	33.1	36.5	36.7	39.4	39.7	40.9	41.9	139.9	161.9	165.8
Capital expenditures		$ 39.9	$ 26.0	$ 20.9	$ 14.3	$ 53.7	$ 26.3	$ 32.3	$ 23.8	$ 101.1	$ 136.1	$ 172.9
Basic
Continuing operations (in dollars per share)		$ (0.07)	$ 0.16	$ (0.26)	$ (0.01)	$ (0.52)	$ 0.59	$ 0.02	$ (1.21)	$ (0.19)	$ (1.12)	$ 1.36
Discontinued operations (in dollars per share)		(0.01)	0.00	0.00	(0.05)	(0.44)	(0.17)	0.01	0.01	(0.06)	(0.59)	(0.19)
Net income (loss) (in dollars per share)		(0.07)	0.16	(0.26)	(0.06)	(0.96)	0.41	0.03	(1.20)	(0.24)	(1.71)	1.17
Diluted
Continuing operations (in dollars per share)		(0.07)	0.16	(0.26)	(0.01)	(0.52)	0.58	0.02	(1.21)	(0.19)	(1.12)	1.35
Discontinued operations (in dollars per share)		(0.01)	0.00	0.00	(0.05)	(0.44)	(0.17)	0.01	0.01	(0.06)	(0.59)	(0.19)
Net income (loss) (in dollars per share)		$ (0.07)	$ 0.15	$ (0.26)	$ (0.06)	$ (0.96)	$ 0.41	$ 0.03	$ (1.20)	$ (0.24)	$ (1.71)	$ 1.16
Effect of Fourth Quarter Events [Line Items]
Net remeasurement gain (loss)					$ (18.0)				$ (121.9)	$ (26.8)	$ (127.2)	$ (18.1)
Venezuela impairment										35.3	0.0	0.0
Gains (losses) on business acquisitions and dispositions										(6.3)	0.0	2.8
Accelerated U.S. income tax expense		$ 23.5
Employee Severance
Effect of Fourth Quarter Events [Line Items]
Restructuring charges incurred						$ 21.8
Reorganization and Restructuring 2015
Effect of Fourth Quarter Events [Line Items]
Expense		9.6	$ 2.0							11.6
Restructuring charges incurred										11.6
Reorganization and Restructuring 2015 | Contract Terminations
Effect of Fourth Quarter Events [Line Items]
Expense										1.6
Reorganization and Restructuring 2015 | Employee Severance
Effect of Fourth Quarter Events [Line Items]
Expense										9.8
Venezuela
Effect of Fourth Quarter Events [Line Items]
Net remeasurement gain (loss)										(18.1)
Venezuela impairment			$ 0.8	$ 34.5						35.3
Russia
Effect of Fourth Quarter Events [Line Items]
Loss on sale of business	$ 5.9	$ 5.9
Peruvian CIT Business
Effect of Fourth Quarter Events [Line Items]
Gains (losses) on business acquisitions and dispositions							$ 44.3				44.3
U.S. Plans
Effect of Fourth Quarter Events [Line Items]
Settlement loss (a)						$ 56.1				$ 0.0	$ 56.1	$ 0.1