Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 13.5	$ 3.4	$ 54.0	$ 2.9
Benefit plan adjustments:
Benefit plan experience gains	11.1	12.6	22.9	24.3
Benefit plan prior service cost	(0.7)	(0.6)	(1.2)	(1.0)
Deferred profit sharing	0.1	0.0	0.1	0.0
Total benefit plan adjustments	10.5	12.0	21.8	23.3
Foreign currency translation adjustments	5.7	(3.5)	32.9	14.3
Unrealized net gains (losses) on available-for-sale securities	0.5	(0.2)	0.7	0.0
Loss on cash flow hedges	(0.1)	(0.1)	(0.1)	(0.4)
Other comprehensive income before tax	16.6	8.2	55.3	37.2
Provision for income taxes	4.4	4.2	8.8	8.0
Other comprehensive income	12.2	4.0	46.5	29.2
Comprehensive income	25.7	7.4	100.5	32.1
Less comprehensive income (loss) attributable to noncontrolling interests	(2.5)	3.3	4.4	6.7
Comprehensive income attributable to Brink's	$ 28.2	$ 4.1	$ 96.1	$ 25.4