Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenues		$ 1,236.1	$ 1,185.4
Costs and expenses:
Cost of revenues		927.2	920.3
Selling, general and administrative expenses		200.6	177.0
Total costs and expenses		1,127.8	1,097.3
Other operating income (expense)		12.6	(8.3)
Operating profit		120.9	79.8
Interest expense		(55.8)	(46.6)
Interest and other nonoperating income (expense)		13.3	4.7
Income from continuing operations before tax		78.4	37.9
Provision for income taxes		26.2	20.3
Income from continuing operations		52.2	17.6
Income from discontinued operations, net of tax		0.0	0.7
Net income		52.2	18.3
Less net income attributable to noncontrolling interests		2.9	3.3
Net income attributable to Brink’s		49.3	15.0
Amounts attributable to Brink’s
Continuing operations		49.3	14.3
Discontinued operations		0.0	0.7
Net income attributable to Brink’s		$ 49.3	$ 15.0
Basic:
Continuing operations (dollars per share)	[1]	$ 1.10	$ 0.31
Discontinued operations (dollar per share)	[1]	0	0.01
Net income (dollars per share)	[1]	1.10	0.32
Diluted:
Continuing operations (dollars per share)	[1]	1.09	0.30
Discontinued operations (dollar per share)	[1]	0	0.01
Net income (dollars per share)	[1]	$ 1.09	$ 0.32
Weighted-average shares
Basic (shares)		44.8	46.7
Diluted (shares)		45.3	47.4
Cash dividends paid per common share (dollars per share)		$ 0.22	$ 0.20

[1] Amounts may not add due to rounding.