Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Revenues		$ 852.4	$ 849.5	$ 2,581.2	$ 2,443.8
Costs and expenses:
Cost of revenues		652.6	666.4	2,013.0	1,905.6
Selling, general and administrative expenses		125.4	116.6	368.4	346.5
Total costs and expenses		778.0	783.0	2,381.4	2,252.1
Other operating expense		(7.4)	(0.1)	(6.3)	(6.1)
Operating profit		67.0	66.4	193.5	185.6
Interest expense		(17.0)	(7.7)	(47.8)	(18.5)
Loss on deconsolidation of Venezuela operations		0.0	0.0	(126.7)	0.0
Interest and other income (expense)		(8.1)	(21.2)	(29.3)	(43.8)
Income (loss) from continuing operations before tax		41.9	37.5	(10.3)	123.3
Provision for income taxes		23.0	16.4	53.0	48.1
Income (loss) from continuing operations		18.9	21.1	(63.3)	75.2
Loss from discontinued operations, net of tax		(0.1)	0.0	0.0	(0.1)
Net income (loss)		18.8	21.1	(63.3)	75.1
Less net income attributable to noncontrolling interests		1.4	1.2	4.9	6.3
Net income (loss) attributable to Brink’s		17.4	19.9	(68.2)	68.8
Amounts attributable to Brink’s
Continuing operations		17.5	19.9	(68.2)	68.9
Discontinued operations		(0.1)	0.0	0.0	(0.1)
Net income (loss) attributable to Brink’s		$ 17.4	$ 19.9	$ (68.2)	$ 68.8
Basic:
Continuing operations (dollars per share)	[1]	$ 0.34	$ 0.39	$ (1.34)	$ 1.36
Discontinued operations (dollars per share)	[1]	0.00	0.00	0.00	0.00
Net income (loss) (dollars per share)	[1]	0.34	0.39	(1.34)	1.36
Diluted:
Continuing operations (dollars per share)	[1]	0.34	0.38	(1.34)	1.33
Discontinued operations (dollars per share)	[1]	0.00	0.00	0.00	0.00
Net income (loss) (dollars per share)	[1]	$ 0.34	$ 0.38	$ (1.34)	$ 1.33
Weighted-average shares
Basic (shares)		51.1	50.7	51.0	50.7
Diluted (shares)		52.0	51.9	51.0	51.6
Cash dividends paid per common share (dollars per share)		$ 0.15	$ 0.15	$ 0.45	$ 0.4

[1] Amounts may not add due to rounding.