Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenues		$ 879.1	$ 788.4
Costs and expenses:
Cost of revenues		693.6	610.3
Selling, general and administrative expenses		123.1	107.1
Total costs and expenses		816.7	717.4
Other operating income (expense)		2.4	(0.1)
Operating profit		64.8	70.9
Interest expense		(15.0)	(4.8)
Interest and other income (expense)		(13.1)	(11.2)
Income from continuing operations before tax		36.7	54.9
Provision for income taxes		11.4	14.4
Income from continuing operations		25.3	40.5
Income from discontinued operations, net of tax		0.2	0.0
Net income		25.5	40.5
Less net income attributable to noncontrolling interests		3.2	5.8
Net income attributable to Brink’s		22.3	34.7
Amounts attributable to Brink’s
Continuing operations		22.1	34.7
Discontinued operations		0.2	0.0
Net income attributable to Brink’s		$ 22.3	$ 34.7
Basic:
Continuing operations (dollars per share)	[1]	$ 0.43	$ 0.69
Discontinued operations (dollars per share)	[1]	0.00	0.00
Net income (loss) (dollars per share)	[1]	0.44	0.69
Diluted:
Continuing operations (dollars per share)	[1]	0.42	0.67
Discontinued operations (dollars per share)	[1]	0.00	0.00
Net income (loss) (dollars per share)	[1]	$ 0.43	$ 0.67
Weighted-average shares
Basic (shares)		50.9	50.5
Diluted (shares)		52.1	51.5
Cash dividends paid per common share (dollars per share)		$ 0.15	$ 0.1

[1] Amounts may not add due to rounding.