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Retirement Plans and Other Post-Retirement Benefits (Details 11) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of fair value of benefit plan assets
Fair value of plan assets	$ 545.7	$ 503.5
Level 1 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	350.6	380.8
Level 2 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	195.1	122.7
Level 3 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets
Large cap [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	169.6	164.5
Large cap [Member] | Level 1 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	169.6	164.5
Large cap [Member] | Level 2 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets
Large cap [Member] | Level 3 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets
Small and mid cap [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	65.7	57.7
Small and mid cap [Member] | Level 1 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	65.7	57.7
Small and mid cap [Member] | Level 2 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets
Small and mid cap [Member] | Level 3 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets
Other [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	1.1	0.6
Other [Member] | Level 1 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	0.8	0.5
Other [Member] | Level 2 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	0.3	0.1
Other [Member] | Level 3 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets
International equity [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	100.3	79.7
International equity [Member] | Level 1 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	61.9	48.3
International equity [Member] | Level 2 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	38.4	31.4
International equity [Member] | Level 3 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets
REIT [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	25.4	26.4
REIT [Member] | Level 1 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	25.4	26.4
REIT [Member] | Level 2 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets
REIT [Member] | Level 3 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets
Fixed Income [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	164.9	157.3
Fixed Income [Member] | Level 1 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	27.2	83.4
Fixed Income [Member] | Level 2 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	137.7	73.9
Fixed Income [Member] | Level 3 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets
Cash and cash equivalents [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	18.7	17.3
Cash and cash equivalents [Member] | Level 2 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets	18.7	17.3
Cash and cash equivalents [Member] | Level 3 [Member]
Schedule of fair value of benefit plan assets
Fair value of plan assets

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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 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 87

-Paragraph 49

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(iv)(b)(i)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 5: 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=21915506&loc=d3e1928-114920

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