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Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement.

+ 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 (i)

-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

-Topic 220

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-Section 45

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-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ 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 (j)

-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

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-Section 50

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

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Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

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- Definition

The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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Retirement Benefits - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Amounts in AOCI to be recognized in retirement cost in next fiscal year [Abstract]
Benefit plan experience gains (losses)	$ 14.2	$ 10.5
Other Benefit Plans [Abstract]
Cash contributions			87.2us-gaap_PensionContributions
US Plans [Member]
Other Benefit Plans [Abstract]
Net periodic pension cost (credit)	3.1	3.2
Non-US Plans [Member]
Other Benefit Plans [Abstract]
Net periodic pension cost (credit)	7.3	6.9
UMWA Plans Postretirement Medical [Member]
Other Benefit Plans [Abstract]
Net periodic pension cost (credit)	2.4	1.8
Pension plan [Member]
Other Benefit Plans [Abstract]
Net periodic pension cost (credit)	10.4	10.1
Retirement benefits other than pension [Member]
Other Benefit Plans [Abstract]
Net periodic pension cost (credit)	4.3	3.0
Primary U.S. retirement plan [Member]
Retirement Benefit Plan Remeasurements [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	$ 0