Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenues		$ 928.4	$ 852.4	$ 2,747.4	$ 2,581.2
Costs and expenses:
Cost of revenues		714.4	652.6	2,125.6	2,013.0
Selling, general and administrative expenses		155.0	125.4	451.3	368.4
Total costs and expenses		869.4	778.0	2,576.9	2,381.4
Other operating income (expense)		(6.5)	(7.4)	(7.0)	(6.3)
Operating profit		52.5	67.0	163.5	193.5
Interest expense		(22.9)	(17.0)	(68.6)	(47.8)
Loss on deconsolidation of Venezuela operations		0.0	0.0	0.0	(126.7)
Interest and other nonoperating income (expense)		(7.8)	(8.1)	(22.1)	(29.3)
Income (loss) from continuing operations before tax		21.8	41.9	72.8	(10.3)
Provision for income taxes		14.7	23.0	37.1	53.0
Income (loss) from continuing operations		7.1	18.9	35.7	(63.3)
Loss from discontinued operations, net of tax		(0.4)	(0.1)	(0.5)	0.0
Net income (loss)		6.7	18.8	35.2	(63.3)
Less net income attributable to noncontrolling interests		1.3	1.4	3.6	4.9
Net income (loss) attributable to Brink’s		5.4	17.4	31.6	(68.2)
Amounts attributable to Brink’s
Continuing operations		5.8	17.5	32.1	(68.2)
Discontinued operations		(0.4)	(0.1)	(0.5)	0.0
Net income (loss) attributable to Brink’s		$ 5.4	$ 17.4	$ 31.6	$ (68.2)
Basic:
Continuing operations (dollars per share)	[1]	$ 0.11	$ 0.34	$ 0.64	$ (1.34)
Discontinued operations (dollars per share)	[1]	(0.01)	0	(0.01)	0
Net income (loss) (dollars per share)	[1]	0.11	0.34	0.63	(1.34)
Diluted:
Continuing operations (dollars per share)	[1]	0.11	0.34	0.63	(1.34)
Discontinued operations (dollars per share)	[1]	(0.01)	0	(0.01)	0
Net income (loss) (dollars per share)	[1]	$ 0.10	$ 0.34	$ 0.62	$ (1.34)
Weighted-average shares
Basic (shares)		50.3	51.1	50.2	51.0
Diluted (shares)		51.1	52.0	51.0	51.0
Cash dividends paid per common share (dollars per share)		$ 0.15	$ 0.15	$ 0.45	$ 0.45

[1] Amounts may not add due to rounding.