Retirement Benefits - Health Care Cost Trends and OPEB Future Ben Pmts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effects of 1% increase on service and interest cost	$ 2.8
Effects of 1% increase on APBO	59.6
Effects of 1% decrease on service and interest cost	(2.3)
Effects of 1% decrease on APBO	(50.3)
Estimated Future Benefits Payments [Line Items]
2013	40.0
2014	39.8
2015	39.7
2016	39.2
2017	38.5
2018 through 2022	185.8
US Plans [Member]
Estimated Future Benefits Payments [Line Items]
2013	45.5
2014	46.8
2015	48.1
2016	49.2
2017	50.8
2018 through 2022	280.5
Non-US Plans [Member]
Estimated Future Benefits Payments [Line Items]
2013	15.6
2014	14.3
2015	15.0
2016	16.0
2017	18.1
2018 through 2022	117.6
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]
2013	38.1
2014	38.3
2015	38.6
2016	38.3
2017	38.0
2018 through 2022	186.8
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]
2013	5.2
2014	4.9
2015	4.6
2016	4.4
2017	4.1
2018 through 2022	17.0
Pension plan [Member]
Estimated Future Benefits Payments [Line Items]
2013	61.1
2014	61.1
2015	63.1
2016	65.2
2017	68.9
2018 through 2022	398.1
Retirement benefits other than pension [Member]
Estimated Future Benefits Payments [Line Items]
2013	43.3
2014	43.2
2015	43.2
2016	42.7
2017	42.1
2018 through 2022	203.8
2013 Medicare Subsidy	(3.3)
2014 Medicare Subsidy	(3.4)
2015 Medicare Subsidy	(3.5)
2016 Medicare Subsidy	(3.5)
2017 Medicare Subsidy	(3.6)
2018 through 2022 Medicare Subsidy	$ (18.0)

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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.

+ 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 (m)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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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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=21915506&loc=d3e1928-114920

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Health Care Cost Trend Rate

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The ultimate trend rate for health care costs.

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- Definition

Amount of the prescription drug subsidy receipts to be received after the fifth fiscal year following the latest fiscal year.

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Amount of the prescription drug subsidy receipts to be received in the next fiscal year following the latest fiscal year.

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Amount of the prescription drug subsidy receipts to be received in the fifth fiscal year following the latest fiscal year.

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Amount of the prescription drug subsidy receipts to be received in the fourth fiscal year following the latest fiscal year.

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Amount of the prescription drug subsidy receipts to be received in the third fiscal year following the latest fiscal year.

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Amount of the prescription drug subsidy receipts to be received in the second fiscal year following the latest fiscal year.

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