Consolidated Statement of Equity - USD ($) shares in Millions, $ in Millions		Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	AOCI	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 (loss)		44.8			34.5		10.3
Other comprehensive loss		(15.8)				(15.1)	(0.7)
Common stock issued		3.0	$ 0.1	2.9
Common stock issued (shares)			0.1
Dividends to:
Brink’s common shareholders ($0.40 per share)		(19.8)			(19.8)
Noncontrolling interests		(4.6)					(4.6)
Stock options and awards:
Compensation expense		9.5		9.5
Consideration from exercise of stock options		12.2	$ 0.5	11.7
Consideration from exercise of stock options (shares)			0.5
Other share-based benefit transactions		(5.3)	$ 0.5	(5.6)	(0.2)
Other share-based benefit transactions (shares)			0.5
Ending Balance at Dec. 31, 2016		354.8	$ 50.0	618.1	576.0	(907.0)	17.7
Ending Balance (shares) at Dec. 31, 2016			50.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle	[1]	0.2			0.2
Net income (loss)		23.6			16.7		6.9
Other comprehensive loss		(18.8)				(19.6)	0.8
Dividends to:
Brink’s common shareholders ($0.40 per share)		(27.7)			(27.7)
Noncontrolling interests		(4.6)					(4.6)
Stock options and awards:
Compensation expense		17.7		17.7
Consideration from exercise of stock options		2.7	$ 0.1	2.6
Consideration from exercise of stock options (shares)			0.1
Other share-based benefit transactions		(9.5)	$ 0.4	(9.8)	(0.1)
Other share-based benefit transactions (shares)			0.4
Ending Balance at Dec. 31, 2017		338.2	$ 50.5	628.6	564.9	(926.6)	20.8
Ending Balance (shares) at Dec. 31, 2017			50.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(27.5)			(33.3)		5.8
Other comprehensive loss		(16.5)				(15.7)	(0.8)
Stock Repurchased During Period, Shares			(1.3)
Stock Repurchased During Period, Value		(93.5)	$ (1.3)	(16.9)	(75.3)
Dividends to:
Brink’s common shareholders ($0.40 per share)		(30.4)			(30.4)
Noncontrolling interests		(5.2)					(5.2)
Stock options and awards:
Compensation expense		28.2		28.2
Consideration from exercise of stock options		0.8	$ 0.0	0.8
Consideration from exercise of stock options (shares)			0.0
Other share-based benefit transactions		(9.4)	$ 0.5	(9.8)	(0.1)
Other share-based benefit transactions (shares)			0.5
Dispositions of noncontrolling interests		(0.4)					(0.4)
Acquisitions of noncontrolling interests		(21.0)		(2.7)		(9.9)	(8.4)
Acquisitions with noncontrolling interests		1.1					1.1
Ending Balance at Dec. 31, 2018		$ 166.6	$ 49.7	$ 628.2	$ 429.1	$ (953.3)	$ 12.9
Ending Balance (shares) at Dec. 31, 2018			49.7

[1] We elected to early adopt the provisions of ASU 2016-09, Improvements to Employee Share-Based Payment Accounting, in the fourth quarter of 2016 resulting in a cumulative effect adjustment to Retained Earnings for previously unrecognized excess tax benefits. See Note 1 for further discussion of the impacts of this standard.