Summary of Significant Accounting Policies (Details) $ in Millions		3 Months Ended				12 Months Ended
	Dec. 16, 2015	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) Country reporting_unit Region ARS / $ VEF / $	Dec. 31, 2014 USD ($) VEF / $	Dec. 31, 2013 USD ($) VEF / $	Feb. 24, 2016 VEF / $	Feb. 11, 2015 USD ($) VEF / $	Mar. 23, 2014 VEF / $	Jan. 31, 2013 VEF / $	Dec. 31, 2012 USD ($)
Venezuela Foreign Currency Transaction [Abstract]
Number of reporting units | reporting_unit						10
Number of countries within Largest 5 Markets | Country						5
Number of regions with Global Markets | Region						3
Foreign currency exchange rate | VEF / $						199
Net remeasurement gain (loss)				$ (18.0)	$ (121.9)	$ (26.8)	$ (127.2)	$ (18.1)
Brinks investments in Venzuelan Operations on an equity-method basis						4.9	2.7
Net monetary assets						647.8	746.9	912.8
Cash and cash equivalents						198.3	176.2	255.5					$ 201.7
Venezuela impairment						35.3	0.0	0.0
Accumulated other comprehensive income						891.9	792.0
Long lived assets of Venezuela						549.0	669.5	758.7
Argentina conversion losses						$ (7.1)	(3.6)	(2.1)
Maximum
Venezuela Foreign Currency Transaction [Abstract]
Remaining useful lives (in years)						12 years
Foreign currency exchange rate | VEF / $						200
Minimum
Venezuela Foreign Currency Transaction [Abstract]
Remaining useful lives (in years)						1 year
Foreign currency exchange rate | VEF / $						170
Argentina
Venezuela Foreign Currency Transaction [Abstract]
Foreign currency exchange rate | ARS / $						12.9
Argentina | Maximum
Venezuela Foreign Currency Transaction [Abstract]
Foreign currency exchange rate | ARS / $						9.8
Argentina | Minimum
Venezuela Foreign Currency Transaction [Abstract]
Foreign currency exchange rate | ARS / $						8.5
Argentina | Argentina, Pesos
Venezuela Foreign Currency Transaction [Abstract]
Cash and cash equivalents						$ 10.9
Argentina conversion losses						(7.1)	(3.6)
Argentina | Argentina, Pesos | Maximum
Venezuela Foreign Currency Transaction [Abstract]
Devaluation settled rates	40.00%
Argentina | Argentina, Pesos | Minimum
Venezuela Foreign Currency Transaction [Abstract]
Devaluation settled rates	30.00%
Venezuela
Venezuela Foreign Currency Transaction [Abstract]
Foreign currency exchange rate | VEF / $										51
Net remeasurement gain (loss)						(18.1)
Exchange rate remeasurement | VEF / $											6
Approved amount for exchange mechanism										$ 1.2
After-tax loss attributable to NCI						5.6	$ (39.7)	$ (4.7)
Venezuela impairment		$ 0.8	$ 34.5			35.3
Long lived assets of Venezuela						6.4
Venezuela | Maximum
Venezuela Foreign Currency Transaction [Abstract]
Foreign currency exchange rate | VEF / $								12			6
Venezuela | Minimum
Venezuela Foreign Currency Transaction [Abstract]
Foreign currency exchange rate | VEF / $								10				5
Venezuela | Venezuelan Bolivar Fuerte
Venezuela Foreign Currency Transaction [Abstract]
Foreign currency exchange rate | VEF / $							50
Net remeasurement gain (loss)							$ (121.6)	$ (13.4)
Nonmonetary assets						13.5	55.0
Brinks investments in Venzuelan Operations on an equity-method basis						26.0	59.6
Net monetary assets						9.5	23.5
Cash and cash equivalents						6.2	12.6
Accumulated other comprehensive income						113.0	113.0
Venezuela | Venezuela Investment
Venezuela Foreign Currency Transaction [Abstract]
Due to Affiliate						$ 18.7	$ 17.6
Subsequent Event
Venezuela Foreign Currency Transaction [Abstract]
Foreign currency exchange rate | VEF / $									205