Selected Quarterly Financial Data (Details) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2011 EUR (€)	Mar. 31, 2011 USD ($)
Quarterly Financial Data [Abstract]
Revenues	$ 966.8			$ 913.3
Operating profit	42.4			37.0
Amounts Attributable To Brink's Income (Loss) From [Abstract]
Continuing operations	17.0			18.9
Discontinued operations	0			1.1
Net income attributable to Brink's	17.0			20.0
Depreciation and amortization	42.2			38.8
Capital expenditures	34.3			29.4
Diluted:
Continuing operations	$ 0.35			$ 0.39
Discontinued operations	$ 0.00			$ 0.02
Net income	$ 0.35			$ 0.41
Basic:
Continuing operations	$ 0.35			$ 0.40
Discontinued operations	$ 0.00			$ 0.02
Net income	$ 0.35			$ 0.42
Settlement Charge		$ 10	€ 7