Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenues		$ 3,488.9	$ 3,347.0	$ 3,020.6
Costs and expenses:
Cost of revenues		2,703.3	2,608.2	2,391.7
Selling, general and administrative expenses		509.2	468.2	424.3
Total costs and expenses		3,212.5	3,076.4	2,816.0
Other operating income (expense)		(1.7)	3.3	(20.1)
Operating profit		274.7	273.9	184.5
Interest expense		(66.7)	(32.2)	(20.4)
Loss on deconsolidation of Venezuela operations		(126.7)	0.0	0.0
Interest and other nonoperating income (expense)		(38.8)	(60.2)	(39.1)
Income from continuing operations before tax		42.5	181.5	125.0
Provision for income taxes		70.0	157.7	78.5
Income (loss) from continuing operations		(27.5)	23.8	46.5
Loss from discontinued operations, net of tax		0.0	(0.2)	(1.7)
Net income (loss)		(27.5)	23.6	44.8
Less net income attributable to noncontrolling interests		5.8	6.9	10.3
Net income (loss) attributable to Brink’s		(33.3)	16.7	34.5
Amounts attributable to Brink’s:
Continuing operations		(33.3)	16.9	36.2
Discontinued operations		0.0	(0.2)	(1.7)
Net income (loss) attributable to Brink’s		$ (33.3)	$ 16.7	$ 34.5
Basic:
Continuing operations (in dollars per share)	[1]	$ (0.65)	$ 0.33	$ 0.72
Discontinued operations (in dollars per share)	[1]	0.00	(0.01)	(0.03)
Net income (loss) (in dollars per share)	[1]	(0.65)	0.33	0.69
Diluted:
Continuing operations (in dollars per share)	[1]	(0.65)	0.33	0.72
Discontinued operations (in dollars per share)	[1]	0.00	(0.01)	(0.03)
Net income (loss) (in dollars per share)	[1]	$ (0.65)	$ 0.32	$ 0.68
Weighted-average shares
Basic (shares)		50.9	50.7	50.0
Diluted (shares)		50.9	51.8	50.6

[1] Amounts may not add due to rounding.