Retirement Benefits - Health Care Cost Trends and OPEB Future Ben Pmts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effects of 1% increase on service and interest cost	$ 2.3
Effects of 1% increase on APBO	45.4
Effects of 1% decrease on service and interest cost	(1.9)
Effects of 1% decrease on APBO	(38.6)
US Plans [Member]
Estimated Future Benefits Payments [Line Items]
2014	47.7
2015	48.9
2016	50.0
2017	51.5
2018	53.1
2019 through 2023	287.3
Non-US Plans [Member]
Estimated Future Benefits Payments [Line Items]
2014	14.6
2015	13.7
2016	16.4
2017	19.1
2018	21.3
2019 through 2023	168.8
UMWA Plans Postretirement Medical [Member]
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Assumed health care cost trend rate used to compute current APBO for next year	7.00%	7.00%
Ultimate Health Care Cost Trend Rate	5.00%	5.00%
Estimated Future Benefits Payments [Line Items]
2014	31.5
2015	31.9
2016	31.5
2017	31.3
2018	32.9
2019 through 2023	148.6
Black Lung And Other Plans Postretirement [Member]
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Assumed health care cost trend rate used to compute current APBO for next year	5.00%
Estimated Future Benefits Payments [Line Items]
2014	5.0
2015	4.7
2016	4.4
2017	4.1
2018	3.8
2019 through 2023	15.9
Pension plan [Member]
Estimated Future Benefits Payments [Line Items]
2014	62.3
2015	62.6
2016	66.4
2017	70.6
2018	74.4
2019 through 2023	456.1
Retirement benefits other than pension [Member]
Estimated Future Benefits Payments [Line Items]
2014	36.5
2015	36.6
2016	35.9
2017	35.4
2018	36.7
2019 through 2023	$ 164.5

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- Definition

Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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- Definition

Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (l)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Health Care Cost Trend Rate

-URI http://asc.fasb.org/extlink&oid=6514820

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The ultimate trend rate for health care costs.

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