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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) $ in Millions	3 Months Ended								6 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($) $ / $	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) $ / $	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) reporting_unit $ / $	Dec. 31, 2017 USD ($) $ / $	Dec. 31, 2016 USD ($) $ / $
Investment [Line Items]
Number of reporting units \| reporting_unit										8
Goodwill	$ 678.6				$ 453.7					$ 678.6	$ 453.7	$ 186.2
Loss on deconsolidation of Venezuela operations										(126.7)	0.0	0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Deconsolidation, pretax										(172.0)	(54.3)	(53.1)
Brinks investments in Venezuelan Operations on an equity-method basis	4.9				4.0					4.9	4.0	3.5
Net monetary liabilities	3,069.4				2,721.4					3,069.4	2,721.4
Cash and cash equivalents	343.4				614.3					343.4	614.3
Accumulated other comprehensive losses related to Venezuela	953.3				926.6					953.3	926.6
Net monetary assets	1,206.5				1,488.2					1,206.5	1,488.2
Revenues	$ 907.7	$ 852.4	$ 849.7	$ 879.1	$ 903.2	$ 849.5	$ 805.9	$ 788.4		$ 3,488.9	3,347.0	3,020.6
Minimum
Investment [Line Items]
Remaining useful lives (in years)										1 year
Percentage of Fair Value in Excess of Carrying Amount	57.00%									57.00%
Maximum
Investment [Line Items]
Remaining useful lives (in years)										15 years
Percentage of Fair Value in Excess of Carrying Amount	236.00%									236.00%
Venezuela
Investment [Line Items]
Revenues										$ 51.4	$ 154.1	$ 109.4
Venezuela \| Venezuelan bolívar fuerte
Investment [Line Items]
Loss on deconsolidation of Venezuela operations			126.7
Derecognition Of The Carrying Amounts Of Assets Included In The Deconsolidation Charge			32.0
Derecognition Of The Carrying Amounts Of Liabilities Included In The Deconsolidation Charge			$ 11.0
Rate decrease percent			97.00%		80.00%				97.00%		80.00%	59.00%
Currency remeasurement gain (loss)							$ (8.1)		$ 2.2		$ (9.1)	$ (4.8)
Income (loss) attributable to noncontrolling interest									$ 2.0		1.0	$ 2.7
Net monetary liabilities					$ 2.3						2.3
Cash and cash equivalents					3.4						3.4
Accumulated other comprehensive losses related to Venezuela					$ 114.9						$ 114.9
ARGENTINA
Investment [Line Items]
Percent of Consolidated Revenue										7.00%	7.00%	5.00%
Revenues										$ 247.2	$ 250.3	$ 156.4
ARGENTINA \| Argentina, Pesos
Investment [Line Items]
Goodwill	$ 99.8									$ 99.8
Rate decrease percent	50.00%				15.00%					50.00%	15.00%
Currency remeasurement gain (loss)		$ (8.1)								$ (6.2)
Net nonmonetary assets	$ 148.2									148.2
Cash and cash equivalents	$ 19.2									$ 19.2
Official exchange rate \| $ / $	37.6				18.6					37.6	18.6	15.9
Net monetary assets	$ 24.4									$ 24.4
Equity Securities	$ 0.0									0.0
Ireland
Investment [Line Items]
Revenues												$ 20.0
Venezuela Investment \| Venezuela \| Venezuelan bolívar fuerte
Investment [Line Items]
Brinks investments in Venezuelan Operations on an equity-method basis					$ 23.1						$ 23.1
Net payables to other Brink's affiliates					2.7						2.7
Net nonmonetary assets					$ 23.0						23.0
Foreign Currency Translation Adjustments
Investment [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Deconsolidation, pretax										$ (107.2)	$ 0.0	$ 0.1
Foreign Currency Translation Adjustments \| Venezuela \| Venezuelan bolívar fuerte
Investment [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Deconsolidation, pretax			$ 106.0
France
Investment [Line Items]
Percentage of Fair Value in Excess of Carrying Amount	9.00%									9.00%
Goodwill	$ 91.2									$ 91.2