Retirement Benefits - Retirement Cost (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
US Plans [Member]
Net periodic pension cost (credit) [Line Items]
Service cost	$ 0	$ 0
Interest cost on projected benefit obligation	9.0	11.4
Return on assets - expected	(13.7)	(15.4)
Amortization of losses	7.8	7.2
Amortization of prior service cost	0	0
Settlement loss	0	0
Net periodic pension cost	3.1	3.2
US Plans [Member] \| Continuing Operations [Member]
Net periodic pension cost (credit) [Line Items]
Net periodic pension cost	3.1	3.2
US Plans [Member] \| Discontinued Operations [Member]
Net periodic pension cost (credit) [Line Items]
Net periodic pension cost	0	0
Non-US Plans [Member]
Net periodic pension cost (credit) [Line Items]
Service cost	2.9	3.5
Interest cost on projected benefit obligation	3.2	5.8
Return on assets - expected	(2.4)	(3.8)
Amortization of losses	1.3	0.5
Amortization of prior service cost	0	0.2
Settlement loss	2.3	0.7
Net periodic pension cost	7.3	6.9
Non-US Plans [Member] \| Continuing Operations [Member]
Net periodic pension cost (credit) [Line Items]
Net periodic pension cost	6.2	6.5
Non-US Plans [Member] \| Discontinued Operations [Member]
Net periodic pension cost (credit) [Line Items]
Net periodic pension cost	1.1	0.4
UMWA Plans Postretirement Medical [Member]
Net periodic pension cost (credit) [Line Items]
Service cost	0	0
Interest cost on projected benefit obligation	4.5	4.8
Return on assets - expected	(5.2)	(5.6)
Amortization of losses	4.3	3.7
Amortization of prior service cost	(1.2)	(1.1)
Net periodic pension cost	2.4	1.8
Black Lung And Other Plans Postretirement Medical [Member]
Net periodic pension cost (credit) [Line Items]
Service cost	0	0
Interest cost on projected benefit obligation	0.7	0.6
Return on assets - expected	0	0
Amortization of losses	0.7	0.2
Amortization of prior service cost	0.5	0.4
Net periodic pension cost	1.9	1.2
Pension plan [Member]
Net periodic pension cost (credit) [Line Items]
Service cost	2.9	3.5
Interest cost on projected benefit obligation	12.2	17.2
Return on assets - expected	(16.1)	(19.2)
Amortization of losses	9.1	7.7
Amortization of prior service cost	0	0.2
Settlement loss	2.3	0.7
Net periodic pension cost	10.4	10.1
Pension plan [Member] \| Continuing Operations [Member]
Net periodic pension cost (credit) [Line Items]
Net periodic pension cost	9.3	9.7
Pension plan [Member] \| Discontinued Operations [Member]
Net periodic pension cost (credit) [Line Items]
Net periodic pension cost	1.1	0.4
Retirement benefits other than pension [Member]
Net periodic pension cost (credit) [Line Items]
Service cost	0	0
Interest cost on projected benefit obligation	5.2	5.4
Return on assets - expected	(5.2)	(5.6)
Amortization of losses	5.0	3.9
Amortization of prior service cost	(0.7)	(0.7)
Net periodic pension cost	$ 4.3	$ 3.0

The amount of gains or losses recognized in net periodic benefit cost.

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512136

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 60

-Glossary Expected Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512171

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (h)(3)

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

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

+ Details

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- Definition

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

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- Definition

Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 15

-Paragraph 6

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (h)(7)

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

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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ 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 (h)(1)

-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 Service Cost (Component of Net Periodic Pension Cost)

-URI http://asc.fasb.org/extlink&oid=6525008

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

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

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