Employee Retirement Plans (Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
Net Periodic Benefit Cost
Service cost	$ 0	$ 0	$ 0.3
Interest cost	29.3	28.2	31.2
Expected return on plan assets	(34.4)	(30.2)	(27.2)
Amortization of prior service credit	0	0	0
Amortization of actuarial (gain) / loss	0	0.3	0
Net periodic benefit cost (income)	(5.1)	(1.7)	4.3
Total expense (income)	(5.1)	(3.8)	4.4
Other Postretirement Benefit Plans, Defined Benefit [Member]
Net Periodic Benefit Cost
Service cost	0	0	0.2
Interest cost	0.1	0.1	0.7
Expected return on plan assets	0	0	0
Amortization of prior service credit	(5.8)	(5.7)	(3.4)
Amortization of actuarial (gain) / loss	(0.3)	0	(0.1)
Net periodic benefit cost (income)	(6.0)	(5.6)	(2.6)
Total expense (income)	(10.9)	(5.6)	(15.4)
Defined Benefit Plan, Curtailments [Member] \| Pension Plans, Defined Benefit [Member]
Net Periodic Benefit Cost
Curtailment/settlement (gain) / loss	0	(2.1)	0.1
Defined Benefit Plan, Curtailments [Member] \| Other Postretirement Benefit Plans, Defined Benefit [Member]
Net Periodic Benefit Cost
Curtailment/settlement (gain) / loss	0	0	(12.8)
Defined Benefit Plan, Termination [Member] \| Pension Plans, Defined Benefit [Member]
Net Periodic Benefit Cost
Curtailment/settlement (gain) / loss	0	0	0
Defined Benefit Plan, Termination [Member] \| Other Postretirement Benefit Plans, Defined Benefit [Member]
Net Periodic Benefit Cost
Curtailment/settlement (gain) / loss	$ (4.9)	$ 0	$ 0

Defined Benefit Plan, Interest Cost, Continuing Operations

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- Definition

Defined Benefit Plan, Net Periodic Benefit Cost Prior to Curtailments and Settlements

+ References

No definition available.

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- Definition

Defined Benefit Plan, Service Cost, Continuing Operations

+ References

No definition available.

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- Definition

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

+ 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)(4)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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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

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=28361610&loc=d3e1928-114920

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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=28361610&loc=d3e1928-114920

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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

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)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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- Definition

Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from 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 20

-Section 50

-Paragraph 1

-Subparagraph (h)(7)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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