Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 181.9	$ 117.3	$ 21.9
Benefit plan adjustments:
Benefit plan actuarial gains (losses)	177.6	189.4	(37.0)
Benefit plan prior service costs	61.7	(4.3)	(5.3)
Deferred profit sharing	(0.1)	(0.4)	0.7
Total benefit plan adjustments	239.2	184.7	(41.6)
Foreign currency translation adjustments	(19.0)	(58.9)	24.2
Unrealized net losses on available-for-sale securities	(0.9)	(0.1)	0.0
Gains (losses) on cash flow hedges	37.6	19.1	(11.2)
Other comprehensive income (loss) before tax	256.9	144.8	(28.6)
Provision (benefit) for income taxes	55.9	55.3	(12.4)
Other comprehensive income (loss)	201.0	89.5	(16.2)
Comprehensive income	382.9	206.8	5.7
Less comprehensive income attributable to noncontrolling interests	5.0	9.5	10.7
Comprehensive income (loss) attributable to Brink’s	$ 377.9	$ 197.3	$ (5.0)