Accumulated other comprehensive income (loss) - Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 |
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] | | | | |
Pretax, benefit plan adjustments, amounts arising during the current period | $ (1.1) | $ (2.6) | $ (5.7) | $ (4.3) |
Income tax, benefit plan adjustments, amounts arising the current period | 0.3 | 0.5 | 1.5 | 0.8 |
Pretax, benefit plan adjustments, amounts reclassified to net income (loss) | 14.2 | 11.2 | 30 | 23 |
Income tax, benefit plan adjustments, amounts reclassified to net income (loss) | (4.8) | (3.9) | (10) | (7.9) |
Total benefit plan adjustments, net of tax | 8.6 | 5.2 | 15.8 | 11.6 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] | | | | |
Pretax, foreign currency translation adjustments, amounts arising during the current period | 6.9 | 8.5 | (43.5) | 4.3 |
Income tax, foreign currency translation adjustments, amounts arising during the current period | 0 | 0 | 0 | 0 |
Pretax, foreign currency translation adjustments, amounts reclassified to net income (loss) | 0 | (0.2) | 0 | (0.2) |
Income tax, foreign currency translation adjustments, amounts reclassified to net income (loss) | 0 | 0 | 0 | 0 |
Total foreign currency translation adjustments, net of tax | 6.9 | 8.3 | (43.5) | 4.1 |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract] | | | | |
Unrealized net gains (losses) on available-for-sale securities | 0 | (0.1) | 0 | (0.2) |
Pretax, foreign currency translation adjustments, amounts reclassified to net income (loss) | 0 | 0.1 | 0 | 0.1 |
Pretax, unrealized gains (losses) on available-for-sale securities, amounts reclassified to net income (loss) | (0.1) | 0 | (0.1) | 0.1 |
Income tax, unrealized gains (losses) on available-for-sale securities, amounts arising during the current period | 0 | 0 | 0 | 0 |
Total unrealized gains (losses) on available-for-sale securities, net of tax | (0.1) | 0 | (0.1) | 0 |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract] | | | | |
Pretax, gains (losses) on cash flow hedges, amounts arising during the current period | (0.2) | (1.4) | 1.9 | (1.7) |
Income tax, gains (losses) on cash flow hedges, amounts arising during the current period | 0 | 0 | 0 | 0 |
Pretax, gains (losses) on cash flow hedges, amounts reclassified to net income (loss) | 0.6 | 0.8 | (1.5) | 1.7 |
Income tax, gains (losses) on cash flow hedges amounts reclassified to net income (loss) | 0 | 0 | 0 | 0 |
Total gains (losses) on cash flow hedges, net of tax | 0.4 | (0.6) | 0.4 | 0 |
Pretax, Other Comprehensive Income (Loss) | 5.6 | 4.4 | (47.3) | (1.9) |
Income Tax, Other Comprehensive Income (Loss) | 0.3 | 0.6 | 1.5 | 0.9 |
Pretax, Amounts Reclassified to Net Income (Loss), Other Comprehensive Income (Loss) | 14.7 | 11.8 | 28.4 | 24.6 |
Income Tax, Amounts Reclassified to Net Income (Loss), Other Comprehensive Income (Loss) | (4.8) | (3.9) | (10) | (7.9) |
Other comprehensive income (loss) | 15.8 | 12.9 | (27.4) | 15.7 |
Amounts attributable to Brink's | | | | |
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] | | | | |
Pretax, benefit plan adjustments, amounts arising during the current period | (1.1) | (2.6) | (5.7) | (4.3) |
Income tax, benefit plan adjustments, amounts arising the current period | 0.3 | 0.5 | 1.5 | 0.8 |
Pretax, benefit plan adjustments, amounts reclassified to net income (loss) | 14.1 | 11.1 | 29.8 | 22.8 |
Income tax, benefit plan adjustments, amounts reclassified to net income (loss) | (4.8) | (3.8) | (10) | (7.8) |
Total benefit plan adjustments, net of tax | 8.5 | 5.2 | 15.6 | 11.5 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] | | | | |
Pretax, foreign currency translation adjustments, amounts arising during the current period | 6.5 | 7.4 | (42.4) | 4 |
Income tax, foreign currency translation adjustments, amounts arising during the current period | 0 | 0 | 0 | 0 |
Pretax, foreign currency translation adjustments, amounts reclassified to net income (loss) | 0 | (0.2) | 0 | (0.2) |
Income tax, foreign currency translation adjustments, amounts reclassified to net income (loss) | 0 | 0 | 0 | 0 |
Total foreign currency translation adjustments, net of tax | 6.5 | 7.2 | (42.4) | 3.8 |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract] | | | | |
Unrealized net gains (losses) on available-for-sale securities | | (0.1) | 0 | (0.2) |
Pretax, foreign currency translation adjustments, amounts reclassified to net income (loss) | | 0.1 | 0 | 0.1 |
Pretax, unrealized gains (losses) on available-for-sale securities, amounts reclassified to net income (loss) | (0.1) | 0 | (0.1) | 0.1 |
Income tax, unrealized gains (losses) on available-for-sale securities, amounts arising during the current period | 0 | 0 | 0 | 0 |
Total unrealized gains (losses) on available-for-sale securities, net of tax | (0.1) | 0 | (0.1) | 0 |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract] | | | | |
Pretax, gains (losses) on cash flow hedges, amounts arising during the current period | (0.2) | (1.4) | 1.9 | (1.7) |
Income tax, gains (losses) on cash flow hedges, amounts arising during the current period | 0 | 0 | 0 | 0 |
Pretax, gains (losses) on cash flow hedges, amounts reclassified to net income (loss) | 0.6 | 0.8 | (1.5) | 1.7 |
Income tax, gains (losses) on cash flow hedges amounts reclassified to net income (loss) | 0 | 0 | 0 | 0 |
Total gains (losses) on cash flow hedges, net of tax | 0.4 | (0.6) | 0.4 | 0 |
Pretax, Other Comprehensive Income (Loss) | 5.2 | 3.3 | (46.2) | (2.2) |
Income Tax, Other Comprehensive Income (Loss) | 0.3 | 0.6 | 1.5 | 0.9 |
Pretax, Amounts Reclassified to Net Income (Loss), Other Comprehensive Income (Loss) | 14.6 | 11.7 | 28.2 | 24.4 |
Income Tax, Amounts Reclassified to Net Income (Loss), Other Comprehensive Income (Loss) | (4.8) | (3.8) | (10) | (7.8) |
Other comprehensive income (loss) | 15.3 | 11.8 | (26.5) | 15.3 |
Attributable to Noncontrolling Interests | | | | |
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] | | | | |
Pretax, benefit plan adjustments, amounts arising during the current period | 0 | 0 | 0 | 0 |
Income tax, benefit plan adjustments, amounts arising the current period | 0 | 0 | 0 | 0 |
Pretax, benefit plan adjustments, amounts reclassified to net income (loss) | 0.1 | 0.1 | 0.2 | 0.2 |
Income tax, benefit plan adjustments, amounts reclassified to net income (loss) | 0 | (0.1) | 0 | (0.1) |
Total benefit plan adjustments, net of tax | 0.1 | 0 | 0.2 | 0.1 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] | | | | |
Pretax, foreign currency translation adjustments, amounts arising during the current period | 0.4 | 1.1 | (1.1) | 0.3 |
Income tax, foreign currency translation adjustments, amounts arising during the current period | 0 | 0 | 0 | 0 |
Pretax, foreign currency translation adjustments, amounts reclassified to net income (loss) | 0 | 0 | 0 | 0 |
Income tax, foreign currency translation adjustments, amounts reclassified to net income (loss) | 0 | 0 | 0 | 0 |
Total foreign currency translation adjustments, net of tax | 0.4 | 1.1 | (1.1) | 0.3 |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract] | | | | |
Pretax, Other Comprehensive Income (Loss) | 0.4 | 1.1 | (1.1) | 0.3 |
Income Tax, Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0 |
Pretax, Amounts Reclassified to Net Income (Loss), Other Comprehensive Income (Loss) | 0.1 | 0.1 | 0.2 | 0.2 |
Income Tax, Amounts Reclassified to Net Income (Loss), Other Comprehensive Income (Loss) | 0 | (0.1) | 0 | (0.1) |
Other comprehensive income (loss) | $ 0.5 | $ 1.1 | $ (0.9) | $ 0.4 |