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	Noncontrolling Interests
Beginning balance at Dec. 31, 2017		$ 338.2	$ 50.5	$ 628.6	$ 564.9	$ (926.6)	$ 20.8
Beginning balance, Shares at Dec. 31, 2017			50.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		25.5			22.3		3.2
Other comprehensive income		12.2				11.1	1.1
Dividends to:
Brink’s common shareholders		(7.6)			(7.6)
Noncontrolling interests		(0.7)					(0.7)
Share-based compensation:
Compensation expense		6.8		6.8
Other share-based benefit transactions		(10.1)	$ 0.4	(10.5)
Other share-based benefit transactions, shares			0.4
Ending balance at Mar. 31, 2018		366.5	$ 50.9	624.9	582.9	(916.6)	24.4
Ending balance, Shares at Mar. 31, 2018			50.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle	[1]	2.2			3.3	(1.1)
Beginning balance at Dec. 31, 2018		166.6	$ 49.7	628.2	429.1	(953.3)	12.9
Beginning balance, Shares at Dec. 31, 2018			49.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		14.5			13.7		0.8
Other comprehensive income		2.2				1.9	0.3
Stock repurchased		0.0	$ 0.0	(0.5)	0.5
Stock repurchased, Shares			0.0
Dividends to:
Brink’s common shareholders		(7.4)			(7.4)
Share-based compensation:
Compensation expense		9.4		9.4
Other share-based benefit transactions		(6.0)	$ 0.2	(6.2)
Other share-based benefit transactions, shares			0.2
Ending balance at Mar. 31, 2019		179.3	$ 49.9	$ 630.9	464.7	(980.2)	$ 14.0
Ending balance, Shares at Mar. 31, 2019			49.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle	[2]	$ 0.0			$ 28.8	$ (28.8)

[1] Effective January 1, 2018, we adopted the provisions of ASU 2014-09, Revenue From Contracts with Customers, ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, and ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory. We recognized a cumulative effect adjustment to January 1, 2018 retained earnings as a result of adopting each of these standards. See Note 1 for further details of the impact of each standard.

[2] Effective January 1, 2019, we adopted the provisions of ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. We recognized a cumulative effect adjustment to January 1, 2019 retained earnings as a result of adopting this standard. See Note 1 for further details.