Benefit Plans (Allocation of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	100.00%	100.00%
Fair value of pension plan assets	$ 284.7	$ 251.0
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	283.5	249.7
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1.2	1.3
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	66.00%	65.00%
Target allocation	65.00%
Allocation range minimum	60.00%
Allocation range maximum	70.00%
Indexed Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	132.6	111.4
Indexed Mutual Funds [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	132.6	111.4
International Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	55.4	49.6
International Mutual Funds [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	55.4	49.6
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	32.00%	34.00%
Target allocation	35.00%
Allocation range minimum	30.00%
Allocation range maximum	40.00%
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations	2.00%	1.00%
Target allocation	0.00%
Allocation range minimum	0.00%
Allocation range maximum	5.00%
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1.0
Cash [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1.0
Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	87.4	83.8
Mutual Funds [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	87.4	83.8
Insurance Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1.2	1.3
Insurance Contract [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1.2	1.3
Balanced Mutual Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	7.1	4.9
Balanced Mutual Fund [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 7.1	$ 4.9

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ 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 (b)

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

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

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Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ 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 (d)(i)

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

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

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-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920

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