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Fair Value of Pension Plan Assets (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | $ 497.4 | $ 470.8
Balance at beginning of period | 85.0 | 57.2
Actual return on plan assets: |  |
Assets sold during the year | 0 | 0.1
Assets still held at year end | 0.9 | (1.8)
Net purchases, sales and settlements | 2.4 | 29.5
Balance at end of period | 88.3 | 85.0
Level 1 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 50.9 | 49.5
Level 2 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 358.2 | 336.3
Level 3 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 88.3 | 85.0
Investment funds |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 398.4 | 369.3
Balance at beginning of period | 43.8 | 53.9
Actual return on plan assets: |  |
Assets sold during the year | 0 | 0.1
Assets still held at year end | 2.2 | (0.6)
Net purchases, sales and settlements | 2.2 | (9.6)
Balance at end of period | 48.2 | 43.8
Investment funds | Level 1 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 22.3 | 18.4
Investment funds | Level 2 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 327.9 | 307.1
Investment funds | Level 3 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 48.2 | 43.8
Insurance contracts |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 24.8 | 24.8
Insurance contracts | Level 1 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 0 | 0
Insurance contracts | Level 2 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 24.8 | 24.8
Insurance contracts | Level 3 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 0 | 0
Limited partnerships |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 39.8 | 41.1
Balance at beginning of period | 41.1 | 3.2
Actual return on plan assets: |  |
Assets sold during the year | 0 | 0
Assets still held at year end | (1.3) | (1.2)
Net purchases, sales and settlements | 0 | 39.1
Balance at end of period | 39.8 | 41.1
Limited partnerships | Level 1 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 0 | 0
Limited partnerships | Level 2 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 0 | 0
Limited partnerships | Level 3 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 39.8 | 41.1
Other plan assets |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 34.4 | 35.6
Balance at beginning of period | 0.1 | 0.1
Actual return on plan assets: |  |
Assets sold during the year | 0 | 0
Assets still held at year end | 0 | 0
Net purchases, sales and settlements | 0.2 | 0
Balance at end of period | 0.3 | 0.1
Other plan assets | Level 1 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 28.6 | 31.1
Other plan assets | Level 2 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 5.5 | 4.4
Other plan assets | Level 3 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | $ 0.3 | $ 0.1

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- Definition Actual return on plan assets, separately identifying the amount related to assets sold during the period. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
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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 + Details
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