Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues		$ 970.5	$ 928.4	$ 2,669.3	$ 2,747.4
Costs and expenses:
Cost of revenues		742.9	714.4	2,120.2	2,125.6
Selling, general and administrative expenses		141.4	155.0	429.1	451.3
Total costs and expenses		884.3	869.4	2,549.3	2,576.9
Other operating income (expense)		(9.8)	(6.5)	(18.4)	(7.0)
Operating profit		76.4	52.5	101.6	163.5
Interest expense		(27.1)	(22.9)	(70.3)	(68.6)
Interest and other nonoperating income (expense)		(12.8)	(7.8)	(31.4)	(22.1)
Income (loss) from continuing operations before tax		36.5	21.8	(0.1)	72.8
Provision for income taxes		58.9	14.7	3.5	37.1
Income (loss) from continuing operations		(22.4)	7.1	(3.6)	35.7
Loss from discontinued operations, net of tax		(0.1)	(0.4)	(0.9)	(0.5)
Net income (loss)		(22.5)	6.7	(4.5)	35.2
Less net income attributable to noncontrolling interests		1.4	1.3	4.7	3.6
Net income (loss) attributable to Brink’s		(23.9)	5.4	(9.2)	31.6
Amounts attributable to Brink’s
Continuing operations		(23.8)	5.8	(8.3)	32.1
Discontinued operations		$ (0.1)	$ (0.4)	$ (0.9)	$ (0.5)
Basic:
Continuing operations (dollars per share)	[1]	$ (0.47)	$ 0.11	$ (0.17)	$ 0.64
Discontinued operations (dollar per share)	[1]	0	(0.01)	(0.02)	(0.01)
Net income (dollars per share)	[1]	(0.48)	0.11	(0.18)	0.63
Diluted:
Continuing operations (dollars per share)	[1]	(0.47)	0.11	(0.17)	0.63
Discontinued operations (dollar per share)	[1]	0	(0.01)	(0.02)	(0.01)
Net income (dollars per share)	[1]	$ (0.48)	$ 0.10	$ (0.18)	$ 0.62
Weighted-average shares
Basic (shares)		50.4	50.3	50.6	50.2
Diluted (shares)		50.4	51.1	50.6	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.