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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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Retirement Benefits - Narrative (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amounts in AOCI to be recognized in retirement cost in next fiscal year [Abstract]
Benefit plan experience gains (losses)			$ (134.3)	$ 265.0	$ 27.3
Other Benefit Plans [Abstract]
Multiemployer Pension Expense			0.1bco_MultiemployerPensionExpense	0.2bco_MultiemployerPensionExpense	0.3bco_MultiemployerPensionExpense
Matching defined contribution expense			4.5	5.5	7.1
Defined contribution plan maximum annual contribution per employee percent	1.00%	4.00%
Retirement Assets [Abstract]
Discount Rate Prescription Drugs				50.00%bco_DiscountRatePrescriptionDrugs
Netherlands CIT Operations [Member]
Retirement Assets [Abstract]
Reclassification adjustments in net income (loss)			5.0
US Plans [Member]
Amounts in AOCI to be recognized in retirement cost in next fiscal year [Abstract]
Benefit plan experience gains (losses)			(45.0)
Accumulated benefit obligation			904.1	934.9
UMWA obligation increase due to "Cadillac" plan excise tax			(101.1)	123.1
Retirement Assets [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets			786.3	811.8	756.3
Reclassification adjustments in net income (loss)			84.3	45.2
Net periodic pension cost (credit)			65.7	30.5	28.3
Non-US Plans [Member]
Amounts in AOCI to be recognized in retirement cost in next fiscal year [Abstract]
Accumulated benefit obligation			242.9	345.3
Estimated contributions			13.5
UMWA obligation increase due to "Cadillac" plan excise tax			(50.3)	11.7
Retirement Assets [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets			179.3	322.0	283.0
Reclassification adjustments in net income (loss)			3.8	8.8
Net periodic pension cost (credit)			26.1	30.7	27.3
Non-US Plans [Member] \| Fair Value, Inputs, Level 1 [Member]
Retirement Assets [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets			177.9	167.9
Non-US Plans [Member] \| Fair Value, Inputs, Level 2 [Member]
Retirement Assets [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets			1.4	154.1
UMWA Plans Postretirement Medical [Member]
Amounts in AOCI to be recognized in retirement cost in next fiscal year [Abstract]
Benefit plan experience gains (losses)			(39.0)
UMWA obligation increase due to "Cadillac" plan excise tax			(58.6)	56.7
Retirement Benefit Plan Remeasurements [Abstract]
Black lung health care cost trend rate			7.00%	7.00%
Black lung health care cost ultimate rate			5.00%	5.00%
Retirement Assets [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets			264.6	284.4	268.7
Reclassification adjustments in net income (loss)			12.4	19.6
Net periodic pension cost (credit)			3.4	18.5	22.0
Black Lung And Other Plans Postretirement [Member]
Amounts in AOCI to be recognized in retirement cost in next fiscal year [Abstract]
Benefit plan experience gains (losses)			(3.0)
UMWA obligation increase due to "Cadillac" plan excise tax			(23.2)	(0.8)
Retirement Benefit Plan Remeasurements [Abstract]
Black lung health care cost trend rate			5.00%
Retirement Assets [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets			0	0	0
Reclassification adjustments in net income (loss)			0.5	0.7
Pension plan [Member]
Amounts in AOCI to be recognized in retirement cost in next fiscal year [Abstract]
Net Gains Losses to be recognized in retirement cost next fiscal year			36.5
Net Prior Service Cost Credit to be recognized in retirement cost next fiscal year			0.1
UMWA obligation increase due to "Cadillac" plan excise tax			(151.4)	134.8
Retirement Assets [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets			965.6	1,133.8	1,039.3
Reclassification adjustments in net income (loss)			88.1	54.0
Net periodic pension cost (credit)			91.8	61.2	55.6
Retirement benefits other than pension [Member]
Amounts in AOCI to be recognized in retirement cost in next fiscal year [Abstract]
Net Gains Losses to be recognized in retirement cost next fiscal year			19.8
Net Prior Service Cost Credit to be recognized in retirement cost next fiscal year			2.9
UMWA obligation increase due to "Cadillac" plan excise tax			(81.8)	55.9
Retirement Assets [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets			264.6	284.4	268.7
Reclassification adjustments in net income (loss)			12.9	20.3
Net periodic pension cost (credit)			8.1	23.1	28.9
Primary U.S. retirement plan [Member]
Amounts in AOCI to be recognized in retirement cost in next fiscal year [Abstract]
Estimated contributions			0
Nonqualified U.S. pension plan [Member]
Amounts in AOCI to be recognized in retirement cost in next fiscal year [Abstract]
Estimated contributions			0.6
Us Definded Contribtution Expense [Member]
Other Benefit Plans [Abstract]
Matching defined contribution expense			2.2	2.6	4.6
Other Defined Contribution Plans Expense [Member]
Other Benefit Plans [Abstract]
Matching defined contribution expense			2.3	2.9	2.5
UMWA Excise Tax [Member]
Amounts in AOCI to be recognized in retirement cost in next fiscal year [Abstract]
UMWA obligation increase due to "Cadillac" plan excise tax			24.8	22.9
Canada Plan [Member]
Retirement Benefit Plan Remeasurements [Abstract]
Black lung health care cost trend rate			7.00%
Black lung health care cost ultimate rate			5.00%
Brazil Plan [Member]
Retirement Benefit Plan Remeasurements [Abstract]
Black lung health care cost trend rate			3.00%
2014 Lump Sum Buy Out [Member]
Amounts in AOCI to be recognized in retirement cost in next fiscal year [Abstract]
Benefit plan experience gains (losses)				40.0
Pension Plan Beneficiaries			15,200
Pension Plan Buy Out Number of Participants			4,300
Post Retirement Benefits, Non US plans [Member]
Retirement Assets [Abstract]
Net periodic pension cost (credit)			$ 0.7	$ 0.7	$ 1.0