Retirement Benefits - Health Care Cost Trends and OPEB Future Ben Pmts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effects of 1% increase on service and interest cost	$ 2.1
Effects of 1% increase on APBO	59.3
Effects of 1% decrease on service and interest cost	(1.8)
Effects of 1% decrease on APBO	(49.6)
US Plans [Member]
Estimated Future Benefits Payments [Line Items]
2015	47.0
2016	47.3
2017	48.0
2018	48.6
2019	49.6
2019 through 2023	250.4
Non-US Plans [Member]
Estimated Future Benefits Payments [Line Items]
2015	12.1
2016	11.7
2017	12.6
2018	14.7
2019	15.9
2019 through 2023	114.3
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]
2015	30.4
2016	30.2
2017	30.3
2018	32.2
2019	31.7
2019 through 2023	143.6
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]
2015	6.3
2016	5.9
2017	5.6
2018	5.2
2019	4.9
2019 through 2023	20.0
Pension plan [Member]
Estimated Future Benefits Payments [Line Items]
2015	59.1
2016	59.0
2017	60.6
2018	63.3
2019	65.5
2019 through 2023	364.7
Retirement benefits other than pension [Member]
Estimated Future Benefits Payments [Line Items]
2015	36.7
2016	36.1
2017	35.9
2018	37.4
2019	36.6
2019 through 2023	$ 163.6

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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 from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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=35743120&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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