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Retirement and Postretirement Plans (Qualified Plan's Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Plan Assets
Fair value	$ 142.8	$ 124.7	$ 120.8
Qualified Plan
Plan Assets
Fair value	142.1	124.0
Asset allocations (as a percent)	100.00%	100.00%
Qualified Plan | Level 1 Inputs
Plan Assets
Fair value	112.1	87.6
Qualified Plan | Level 2 Inputs
Plan Assets
Fair value	30.0	36.4
Qualified Plan | Level 3 Inputs
Plan Assets
Fair value	0	0
Qualified Plan | Fixed maturity investments
Plan Assets
Fair value	0	1.9
Asset allocations (as a percent)	0.00%	1.50%
Qualified Plan | Fixed maturity investments | Level 1 Inputs
Plan Assets
Fair value	0	0
Qualified Plan | Fixed maturity investments | Level 2 Inputs
Plan Assets
Fair value	0	1.9
Qualified Plan | Fixed maturity investments | Level 3 Inputs
Plan Assets
Fair value	0	0
Qualified Plan | Common equity securities
Plan Assets
Fair value	103.3	79.5
Asset allocations (as a percent)	72.70%	64.20%
Qualified Plan | Common equity securities | Level 1 Inputs
Plan Assets
Fair value	103.3	79.5
Qualified Plan | Common equity securities | Level 2 Inputs
Plan Assets
Fair value	0	0
Qualified Plan | Common equity securities | Level 3 Inputs
Plan Assets
Fair value	0	0
Qualified Plan | Convertible fixed maturity investments
Plan Assets
Fair value	29.9	34.5
Asset allocations (as a percent)	21.10%	27.80%
Qualified Plan | Convertible fixed maturity investments | Level 1 Inputs
Plan Assets
Fair value	0	0
Qualified Plan | Convertible fixed maturity investments | Level 2 Inputs
Plan Assets
Fair value	29.9	34.5
Qualified Plan | Convertible fixed maturity investments | Level 3 Inputs
Plan Assets
Fair value	0	0
Qualified Plan | Cash
Plan Assets
Fair value	8.9	8.1
Asset allocations (as a percent)	6.20%	6.50%
Qualified Plan | Cash | Level 1 Inputs
Plan Assets
Fair value	8.8	8.1
Qualified Plan | Cash | Level 2 Inputs
Plan Assets
Fair value	0.1	0
Qualified Plan | Cash | Level 3 Inputs
Plan Assets
Fair value	$ 0	$ 0

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- Definition

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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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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

-Subparagraph (c)

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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

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

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