Condensed Consolidated Statement of Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss	Attributable to Noncontrolling Interests
Beginning balance at Dec. 31, 2015	$ 330.6	$ 48.9	$ 599.6	$ 561.3	$ (891.9)	$ 12.7
Beginning balance, Shares at Dec. 31, 2015		48.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(0.5)			(3.1)		2.6
Other comprehensive income	25.2				24.4	0.8
Dividends to:
Brink’s common shareholders ($0.10 per share)	(4.9)			(4.9)
Noncontrolling interests	(0.2)					(0.2)
Share-based compensation:
Compensation expense	2.8		2.8
Consideration from exercise of stock options	0.1		0.1
Other share-based benefit transactions	(3.1)	$ 0.3	(3.5)	0.1
Other share-based benefit programs, shares		0.3
Ending balance at Mar. 31, 2016	350.2	$ 49.2	599.0	553.6	(867.5)	15.9
Ending balance, Shares at Mar. 31, 2016		49.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle(a)	0.2			0.2
Beginning balance at Dec. 31, 2016	354.8	$ 50.0	618.1	576.0	(907.0)	17.7
Beginning balance, Shares at Dec. 31, 2016		50.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	40.5			34.7		5.8
Other comprehensive income	34.3				33.2	1.1
Dividends to:
Brink’s common shareholders ($0.10 per share)	(5.0)			(5.0)
Noncontrolling interests	(0.2)					(0.2)
Share-based compensation:
Compensation expense	4.5		4.5
Consideration from exercise of stock options	0.7		0.7
Other share-based benefit transactions	(8.4)	$ 0.4	(8.8)
Other share-based benefit programs, shares		0.4
Ending balance at Mar. 31, 2017	$ 421.2	$ 50.4	$ 614.5	$ 605.7	$ (873.8)	$ 24.4
Ending balance, Shares at Mar. 31, 2017		50.4