Retirement Benefits - Estimated Future Pension Benef Pmts (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
US Plans [Member]
Net periodic pension cost (credit) [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]
Net periodic pension cost (credit) [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]
Net periodic pension cost (credit) [Line Items]
2015	30.4
2016	30.2
2017	30.3
2018	32.2
2019	31.7
2019 through 2023	143.6
Pension plan [Member]
Net periodic pension cost (credit) [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]
Net periodic pension cost (credit) [Line Items]
2015	36.7
2016	36.1
2017	35.9
2018	37.4
2019	36.6
2019 through 2023	163.6
Black Lung And Other Plans Postretirement [Member]
Net periodic pension cost (credit) [Line Items]
2015	6.3
2016	5.9
2017	5.6
2018	5.2
2019	4.9
2019 through 2023	$ 20.0

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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.

+ 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 (f)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

+ Details

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- Definition

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.

+ References

+ Details

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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.

+ References

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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.

+ References

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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.

+ References

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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.

+ References

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