Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 117.3	$ 21.9	$ 33.2
Adjustments to reconcile net income to net cash provided by operating activities:
(Income) loss from discontinued operations, net of tax	(2.1)	0.8	(0.7)
Depreciation and amortization	239.5	206.8	185.0
Share-based compensation expense	33.1	31.3	42.7
Deferred income taxes	14.6	(28.2)	(33.3)
Gains on sale of property, equipment and marketable securities	(17.7)	(11.6)	(2.9)
Gain on business dispositions	0.0	(4.1)	0.0
Impairment losses	9.5	11.6	7.7
Retirement benefit funding (more) less than expense:
Pension	12.4	9.5	24.1
Other than pension	14.2	14.3	16.0
Remeasurement losses due to Argentina currency devaluation	9.0	7.7	11.3
Other operating	(5.8)	15.6	18.1
Changes in operating assets and liabilities, net of effects of acquisitions:
Increase (Decrease) in Receivables	21.2	(45.1)	(15.8)
Accounts payable, income taxes payable and accrued liabilities	45.1	(114.5)	35.0
Restricted cash held for customers	60.2	116.3	23.7
Customer obligations	15.7	(6.5)	11.4
Prepaid and other current assets	(16.8)	(24.5)	(11.3)
Other	(29.0)	26.2	(7.2)
Net cash provided by operating activities	478.0	317.7	368.6
Cash flows from investing activities:
Capital expenditures	(167.9)	(118.5)	(164.8)
Acquisitions, net of cash acquired	(313.2)	(439.7)	(183.9)
Dispositions, net of cash disposed	0.0	(2.6)	11.2
Marketable securities:
Purchases	(15.6)	(2.9)	(11.8)
Sales	35.1	2.0	1.3
Cash proceeds from sale of property, equipment and investments	7.7	5.3	10.3
Redemption of cash-surrender value of life insurance policies	0.0	0.0	7.8
Other	(0.8)	(9.0)	(3.1)
Net cash used by investing activities	(454.7)	(565.4)	(333.0)
Cash flows from financing activities:
Short-term borrowings	(4.3)	(3.9)	(14.8)
Cash supply chain customer debt	0.0	(10.5)	0.0
Long-term revolving credit facilities: Borrowings	3,385.5	897.8	892.7
Long-term revolving credit facilities: Repayments	(2,836.8)	(1,008.9)	(1,117.8)
Other long-term debt: Borrowings	7.7	1,022.6	335.0
Other long-term debt: Repayments	(140.7)	(98.5)	(63.8)
Settlement of acquisition-related contingencies	6.2	9.7
Payment of acquisition-related obligation	(4.0)	(7.3)	(20.3)
Debt financing costs	(0.8)	(13.2)	(4.0)
Repurchase shares of Brink's common stock	(200.0)	(50.0)	0.0
Dividends to:
Shareholders of Brink’s	(37.2)	(30.1)	(29.9)
Noncontrolling interests in subsidiaries	(5.1)	(16.8)	(2.3)
Proceeds from exercise of stock options	2.3	0.0	0.0
Tax withholdings associated with share-based compensation	5.5	10.3	8.9
Cross currency swap contract	4.0	3.1	(3.9)
Net cash provided (used) by financing activities	171.3	683.7	(38.0)
Effect of exchange rate changes on cash and cash equivalents	(50.8)	37.9	(8.1)
Cash, cash equivalents and restricted cash:
Increase (decrease)	143.8	473.9	(10.5)
Balance at beginning of period	942.9	469.0	479.5
Balance at end of period	$ 1,086.7	$ 942.9	$ 469.0