Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenues		$ 849.7	$ 805.9	$ 1,728.8	$ 1,594.3
Costs and expenses:
Cost of revenues		666.8	628.9	1,360.4	1,239.2
Selling, general and administrative expenses		119.9	122.8	243.0	229.9
Total costs and expenses		786.7	751.7	1,603.4	1,469.1
Other operating income (expense)		(1.3)	(5.9)	1.1	(6.0)
Operating profit		61.7	48.3	126.5	119.2
Interest expense		(15.8)	(6.0)	(30.8)	(10.8)
Loss on deconsolidation of Venezuela operations		(126.7)	0.0	(126.7)	0.0
Interest and other income (expense)		(8.1)	(11.4)	(21.2)	(22.6)
Income (loss) from continuing operations before tax		(88.9)	30.9	(52.2)	85.8
Provision for income taxes		18.6	17.3	30.0	31.7
Income (loss) from continuing operations		(107.5)	13.6	(82.2)	54.1
Income (loss) from discontinued operations, net of tax		(0.1)	(0.1)	0.1	(0.1)
Net income (loss)		(107.6)	13.5	(82.1)	54.0
Less net income (loss) attributable to noncontrolling interests		0.3	(0.7)	3.5	5.1
Net income (loss) attributable to Brink’s		(107.9)	14.2	(85.6)	48.9
Amounts attributable to Brink’s
Continuing operations		(107.8)	14.3	(85.7)	49.0
Discontinued operations		(0.1)	(0.1)	0.1	(0.1)
Net income (loss) attributable to Brink’s		$ (107.9)	$ 14.2	$ (85.6)	$ 48.9
Basic:
Continuing operations (dollars per share)	[1]	$ (2.11)	$ 0.28	$ (1.68)	$ 0.97
Discontinued operations (dollars per share)	[1]	0.00	0.00	0.00	0.00
Net income (loss) (dollars per share)	[1]	(2.11)	0.28	(1.68)	0.97
Diluted:
Continuing operations (dollars per share)	[1]	(2.11)	0.28	(1.68)	0.95
Discontinued operations (dollars per share)	[1]	0.00	0.00	0.00	0.00
Net income (loss) (dollars per share)	[1]	$ (2.11)	$ 0.28	$ (1.68)	$ 0.95
Weighted-average shares
Basic (shares)		51.2	50.7	51.0	50.6
Diluted (shares)		51.2	51.6	51.0	51.5
Cash dividends paid per common share (dollars per share)		$ 0.15	$ 0.15	$ 0.3	$ 0.25

[1] Amounts may not add due to rounding.