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Percentage Less Favorable Than Foreign Currency Exchange Rate, Translation

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Amount of net assets (liabilities).

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Represents gains or losses resulting from transactions conducted in foreign currencies.

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Foreign exchange rate used to remeasure amounts denominated in a currency other than functional currency into functional currency.

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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to noncontrolling interests.

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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) $ in Millions		3 Months Ended								12 Months Ended
	Dec. 16, 2015	Dec. 31, 2017 USD ($) ARS / $ VEF / $	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) VEF / $	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($) VEF / $	Dec. 31, 2017 USD ($) reporting_unit ARS / $ VEF / $	Dec. 31, 2016 USD ($) VEF / $	Dec. 31, 2015 USD ($) ARS / $ VEF / $	Dec. 31, 2014 USD ($)
Investment [Line Items]
Number of reporting units \| reporting_unit										8
Net remeasurement gain (loss)										$ (9.2)	$ 1.4	$ (26.8)
Brinks investments in Venezuelan Operations on an equity-method basis		$ 4.0				$ 3.5				4.0	3.5
Bolivar-denominated nonmonetary assets		1,191.0				684.1				1,191.0	684.1	647.8
Cash and cash equivalents		614.3				183.5				614.3	183.5	181.9	$ 176.2
Accumulated other comprehensive income		926.6				907.0				926.6	907.0
Venezuela impairment										0.0	0.0	35.3
Long lived assets of Venezuela		640.9				531.0				640.9	531.0	549.0
Argentina conversion losses										0.0	0.1	7.1
Revenues		$ 903.2	$ 849.5	$ 805.9	$ 788.4	$ 803.5	$ 755.8	$ 739.5	$ 721.8	$ 3,347.0	$ 3,020.6	3,061.4
Minimum
Investment [Line Items]
Remaining useful lives (in years)										1 year
Maximum
Investment [Line Items]
Remaining useful lives (in years)										10 years
Venezuela
Investment [Line Items]
Decline in rate						59.00%					59.00%
Venezuela impairment											$ 13.6	35.3
Revenues										$ 154.1	109.4	$ 84.5
Venezuela \| Venezuelan bolívar fuerte
Investment [Line Items]
Foreign currency exchange rate \| VEF / $												199
Net remeasurement gain (loss)										(9.1)	(4.8)	$ (18.1)
After-tax income (loss) attributable to NCI										$ 1.0	$ 2.7	$ 5.6
Exchange rate remeasurement \| VEF / $		3,345				674			273	3,345	674	199
Decline in rate		80.00%				70.00%				80.00%	70.00%
Bolivar-denominated nonmonetary assets		$ 2.3				$ 1.4				$ 2.3	$ 1.4
Cash and cash equivalents		3.4				6.8				3.4	6.8
Accumulated other comprehensive income		114.9				114.7				114.9	114.7
Venezuela impairment												$ 35.3
Long lived assets of Venezuela		14.6								14.6
Venezuela \| Venezuelan bolívar fuerte \| Minimum
Investment [Line Items]
Foreign currency exchange rate \| VEF / $												170
Venezuela \| Venezuelan bolívar fuerte \| Maximum
Investment [Line Items]
Foreign currency exchange rate \| VEF / $												200
ARGENTINA
Investment [Line Items]
Bolivar-denominated nonmonetary assets		$ 234.0				$ 28.6				$ 234.0	$ 28.6	$ 28.3
Percent of Consolidated Revenue										7.00%	5.00%	5.00%
Revenues										$ 250.3	$ 156.4	$ 158.4
ARGENTINA \| Argentina, Pesos
Investment [Line Items]
Foreign currency exchange rate \| ARS / $		18.6								18.6
Decline in rate		15.00%				19.00%				15.00%	19.00%
Cash and cash equivalents		$ 33.2								$ 33.2
Argentina conversion losses											$ 0.1	$ 7.1
ARGENTINA \| Argentina, Pesos \| Minimum
Investment [Line Items]
Foreign currency exchange rate \| ARS / $												8.5
Devaluation settled rates	30.00%
ARGENTINA \| Argentina, Pesos \| Maximum
Investment [Line Items]
Foreign currency exchange rate \| ARS / $												9.8
Devaluation settled rates	40.00%
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				$ 19.2				23.1	19.2
Net payables to affiliates		2.7				6.1				2.7	6.1
Venezuelan operations nonmonetary assets		$ 23.0				$ 17.6				$ 23.0	$ 17.6