Summary of Significant Accounting Policies (Details) $ in Millions		3 Months Ended								12 Months Ended
	Dec. 16, 2015	Dec. 31, 2016 USD ($) country region ARS / $ VEF / $	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($) VEF / $	Dec. 31, 2015 USD ($) ARS / $ VEF / $	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) country reporting_unit region ARS / $ VEF / $	Dec. 31, 2015 USD ($) ARS / $ VEF / $	Dec. 31, 2014 USD ($) VEF / $	Mar. 23, 2014 VEF / $	Dec. 31, 2013 USD ($)
Investment [Line Items]
Number of reporting units | reporting_unit										10
Number of countries within Largest 5 Markets | country		5								5
Number of regions with Global Markets | region		3								3
Foreign currency exchange rate | VEF / $						199					199
Net remeasurement gain (loss)									$ (18.0)	$ 1.4	$ (26.8)	$ (127.2)
Brinks investments in Venezuelan Operations on an equity-method basis		$ 3.5				$ 4.9				3.5	4.9
Bolivar-denominated nonmonetary assets		684.1				647.8				684.1	647.8	746.9
Cash and cash equivalents		183.5				181.9				183.5	181.9	176.2		$ 255.5
Accumulated other comprehensive income		907.0				891.9				907.0	891.9
Venezuela impairment										0.0	35.3	0.0
Long lived assets of Venezuela		531.0				549.0				531.0	549.0	669.5
Revenues		803.5	$ 755.8	$ 739.5	$ 721.8	765.8	$ 759.2	$ 760.3	$ 776.1	3,020.6	3,061.4	3,562.3
Restricted cash		55.5				16.4				55.5	16.4
Accrued liabilities		385.7				401.2				385.7	401.2
Current maturities of long-term debt		$ 32.8				$ 39.8				32.8	39.8
Net cash provided by operating activities										167.5	195.9	141.3
Net cash (used) provided by financing activities										44.9	52.5	(3.3)
Argentina conversion losses										$ 0.1	$ 7.1	$ 3.6
Maximum
Investment [Line Items]
Remaining useful lives (in years)										11 years
Foreign currency exchange rate | VEF / $						200					200
Minimum
Investment [Line Items]
Remaining useful lives (in years)										1 year
Foreign currency exchange rate | VEF / $						170					170
Venezuela
Investment [Line Items]
Foreign currency exchange rate | VEF / $												51
Net remeasurement gain (loss)										$ (4.8)
Exchange rate remeasurement | VEF / $		674			273					674		6.3
After-tax income (loss) attributable to NCI										$ 2.7	$ (5.6)	$ (39.7)
Approved amount for exchange mechanism												$ 1.2
Decline in rate		59.00%								59.00%
Venezuela impairment							$ 0.8	$ 34.5		$ 13.6	35.3
Long lived assets of Venezuela		$ 10.1								$ 10.1
Venezuela | Maximum
Investment [Line Items]
Foreign currency exchange rate | VEF / $													6.3
Venezuela | Venezuelan bolívar fuerte
Investment [Line Items]
Foreign currency exchange rate | VEF / $												50
Net remeasurement gain (loss)											(18.1)	$ (121.6)
Exchange rate remeasurement | VEF / $		674								674
Brinks investments in Venezuelan Operations on an equity-method basis		$ 19.2				$ 26.0				$ 19.2	26.0
Venezuelan operations nonmonetary assets		17.6				13.5				17.6	13.5
Bolivar-denominated nonmonetary assets		1.4				9.5				1.4	9.5
Cash and cash equivalents		6.8				6.2				6.8	6.2
Accumulated other comprehensive income		$ 114.7				$ 113.0				$ 114.7	113.0
Ireland
Investment [Line Items]
Revenues											$ 20.0
Argentina
Investment [Line Items]
Foreign currency exchange rate | ARS / $		15.9								15.9
Argentina | Maximum
Investment [Line Items]
Foreign currency exchange rate | ARS / $						9.8					9.8
Argentina | Minimum
Investment [Line Items]
Foreign currency exchange rate | ARS / $						8.5					8.5
Argentina | Argentina, Pesos
Investment [Line Items]
Cash and cash equivalents		$ 11.6								$ 11.6
Argentina conversion losses										0.1	$ 7.1	$ 3.6
Argentina | Argentina, Pesos | Maximum
Investment [Line Items]
Devaluation settled rates	40.00%
Argentina | Argentina, Pesos | Minimum
Investment [Line Items]
Devaluation settled rates	30.00%
Venezuela Investment | Venezuela
Investment [Line Items]
Net payables to affiliates		$ 6.1				$ 18.7				$ 6.1	18.7
Adjustment for Misclassification Error Correction
Investment [Line Items]
Net cash provided by operating activities											208.8
Net cash (used) provided by financing activities											49.0
Restatement Adjustment | Adjustment for Misclassification Error Correction
Investment [Line Items]
Restricted cash						16.4					16.4
Accrued liabilities						(12.9)					(12.9)
Current maturities of long-term debt						$ 3.5					$ 3.5