Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ 21.9	$ 33.2	$ (27.5)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
(Income) loss from discontinued operations, net of tax	0.8	(0.7)	0.0
Depreciation and amortization	206.8	185.0	162.3
Share-based compensation expense	31.3	42.7	28.2
Deferred income taxes	(28.2)	(33.3)	(20.5)
(Gains) on sale of property, equipment and marketable securities	(11.6)	(2.9)	(7.2)
Gain on business dispositions	(4.1)	0.0	(11.2)
Loss on deconsolidation of Venezuela operations	0.0	0.0	126.7
Impairment losses	11.6	7.7	6.5
Retirement benefit funding (more) less than expense:
Pension	9.5	24.1	6.6
Other than pension	14.3	16.0	19.5
Remeasurement losses due to Argentina and Venezuela currency devaluations	7.7	11.3	4.0
Other operating	15.6	18.1	8.2
Changes in operating assets and liabilities, net of effects of acquisitions:
Increase (Decrease) in Receivables	(45.1)	(15.8)	49.7
Accounts payable, income taxes payable and accrued liabilities	(114.5)	35.0	69.0
Restricted cash held for customers	116.3	23.7	44.4
Customer obligations	(6.5)	11.4	(1.7)
Prepaid and other current assets	(24.5)	(11.3)	0.3
Other	26.2	(7.2)	6.2
Net cash provided by operating activities	317.7	368.6	364.1
Cash flows from investing activities:
Capital expenditures	(118.5)	(164.8)	(155.1)
Acquisitions, net of cash acquired	(439.7)	(183.9)	(520.9)
Dispositions, net of cash disposed	(2.6)	11.2	8.4
Marketable securities:
Purchases	(2.9)	(11.8)	(62.4)
Sales	2.0	1.3	54.2
Cash proceeds from sale of property, equipment and investments	5.3	10.3	4.0
Redemption of cash-surrender value of life insurance policies	0.0	7.8	0.0
Other	(9.0)	(3.1)	(0.9)
Net cash used by investing activities	(565.4)	(333.0)	(672.7)
Cash flows from financing activities:
Short-term borrowings	(3.9)	(14.8)	1.3
Cash supply chain customer debt	(10.5)	0.0	(15.6)
Long-term revolving credit facilities: Borrowings	897.8	892.7	982.8
Long-term revolving credit facilities: Repayments	(1,008.9)	(1,117.8)	(642.8)
Other long-term debt: Borrowings	1,022.6	335.0	2.2
Other long-term debt: Repayments	(98.5)	(63.8)	(56.7)
Debt financing costs	(13.2)	(4.0)	0.0
Acquisitions of noncontrolling interests	0.0	0.0	(21.0)
Payment of acquisition-related obligation	(7.3)	(20.3)	(17.6)
Settlement of acquisition-related contingencies	9.7
Repurchase shares of Brink's common stock	(50.0)	0.0	(93.5)
Dividends to:
Shareholders of Brink’s	(30.1)	(29.9)	(30.4)
Noncontrolling interests in subsidiaries	(16.8)	(2.3)	(5.2)
Proceeds from exercise of stock options	0.0	0.0	0.8
Tax withholdings associated with share-based compensation	10.3	8.9	11.5
Cross currency swap contract	3.1	(3.9)	0.6
Net cash provided (used) by financing activities	683.7	(38.0)	93.4
Effect of exchange rate changes on cash and cash equivalents	37.9	(8.1)	(32.2)
Cash, cash equivalents and restricted cash:
Increase (decrease)	473.9	(10.5)	(247.4)
Balance at beginning of period	469.0	479.5	726.9
Balance at end of period	$ 942.9	$ 469.0	$ 479.5