Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenues		$ 1,227.4	$ 1,136.7	$ 3,629.0	$ 3,344.6
Costs and expenses:
Cost of revenues		921.0	880.7	2,785.1	2,587.9
Selling, general and administrative expenses		170.0	180.8	517.6	519.9
Total costs and expenses		1,091.0	1,061.5	3,302.7	3,107.8
Other operating income (expense)		1.3	(15.7)	(3.2)	(18.4)
Operating profit		137.7	59.5	323.1	218.4
Interest expense		(53.8)	(34.7)	(151.5)	(95.0)
Interest and other nonoperating income (expense)		2.9	6.3	11.7	8.4
Income from continuing operations before tax		86.8	31.1	183.3	131.8
Provision (benefit) for income taxes		37.3	8.5	81.0	(3.3)
Income from continuing operations		49.5	22.6	102.3	135.1
Income (loss) from discontinued operations, net of tax		(0.1)	0.0	0.5	(0.2)
Net income		49.4	22.6	102.8	134.9
Less net income attributable to noncontrolling interests		3.8	3.4	10.1	9.3
Net income attributable to Brink’s		45.6	19.2	92.7	125.6
Amounts attributable to Brink’s
Continuing operations		45.7	19.2	92.2	125.8
Discontinued operations		(0.1)	0.0	0.5	(0.2)
Net income attributable to Brink’s		$ 45.6	$ 19.2	$ 92.7	$ 125.6
Basic:
Continuing operations (dollars per share)	[1]	$ 0.98	$ 0.41	$ 1.98	$ 2.65
Discontinued operations (dollar per share)	[1]	0	0	0.01	0
Net income (dollars per share)	[1]	0.98	0.41	1.99	2.64
Diluted:
Continuing operations (dollars per share)	[1]	0.97	0.41	1.95	2.63
Discontinued operations (dollar per share)	[1]	0	0	0.01	0
Net income (dollars per share)	[1]	$ 0.97	$ 0.40	$ 1.96	$ 2.62
Weighted-average shares
Basic (shares)		46.5	47.4	46.6	47.5
Diluted (shares)		47.1	47.5	47.3	47.9
Cash dividends paid per common share (dollars per share)		$ 0.22	$ 0.20	$ 0.64	$ 0.60

[1] Amounts may not add due to rounding.