Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenues		$ 872.8	$ 905.0
Costs and expenses:
Cost of revenues		693.4	702.7
Selling, general and administrative expenses		148.1	141.7
Total costs and expenses		841.5	844.4
Other operating income (expense)		(5.1)	(2.2)
Operating profit		26.2	58.4
Interest expense		(20.0)	(23.0)
Interest and other nonoperating expense		(15.6)	(11.2)
Income (loss) from continuing operations before tax		(9.4)	24.2
Provision (benefit) for income taxes		(12.2)	9.7
Income from continuing operations		2.8	14.5
Net income		2.8	14.5
Less net income attributable to noncontrolling interests		1.0	0.8
Net income attributable to Brink’s		$ 1.8	$ 13.7
Basic:
Continuing operations (dollars per share)	[1]	$ 0.04	$ 0.27
Net income (dollars per share)	[1]	0.03	0.27
Diluted:
Continuing operations (dollars per share)	[1]	0.03	0.27
Net income (dollars per share)	[1]	$ 0.03	$ 0.27
Weighted-average shares
Basic (shares)		50.6	50.0
Diluted (shares)		51.3	50.9
Cash dividends paid per common share (dollars per share)		$ 0.15	$ 0.15

[1] Amounts may not add due to rounding.