Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 40.5	$ (0.5)
Benefit plan adjustments:
Benefit plan experience gains	11.8	11.7
Benefit plan prior service cost	(0.5)	(0.4)
Total benefit plan adjustments	11.3	11.3
Foreign currency translation adjustments	27.2	17.8
Unrealized net gains on available-for-sale securities	0.2	0.2
Loss on cash flow hedges	0.0	(0.3)
Other comprehensive income before tax	38.7	29.0
Provision for income taxes	4.4	3.8
Other comprehensive income	34.3	25.2
Comprehensive income	74.8	24.7
Less comprehensive income attributable to noncontrolling interests	6.9	3.4
Comprehensive income attributable to Brink's	$ 67.9	$ 21.3