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Fair Value of Pension Plan Assets (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | $ 508.1 | $ 497.4
Balance at beginning of period | 88.3 | 85.0
Actual return on plan assets: |  |
Assets sold during the year | 0.6 | 0
Assets still held at year end | (0.8) | 0.9
Net purchases, sales and settlements | (26.0) | 2.4
Balance at end of period | 62.1 | 88.3
Level 1 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 62.4 | 50.9
Level 2 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 383.6 | 358.2
Level 3 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 62.1 | 88.3
Investment funds |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 406.7 | 398.4
Balance at beginning of period | 48.2 | 43.8
Actual return on plan assets: |  |
Assets sold during the year | 0.6 | 0
Assets still held at year end | 1.9 | 2.2
Net purchases, sales and settlements | (25.3) | 2.2
Balance at end of period | 25.4 | 48.2
Investment funds | Level 1 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 22.2 | 22.3
Investment funds | Level 2 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 359.1 | 327.9
Investment funds | Level 3 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 25.4 | 48.2
Insurance contracts |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 22.0 | 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 | 22.0 | 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 | 36.1 | 39.8
Balance at beginning of period | 39.8 | 41.1
Actual return on plan assets: |  |
Assets sold during the year | 0 | 0
Assets still held at year end | (2.9) | (1.3)
Net purchases, sales and settlements | (0.8) | 0
Balance at end of period | 36.1 | 39.8
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 | 36.1 | 39.8
Other plan assets |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 43.3 | 34.4
Balance at beginning of period | 0.3 | 0.1
Actual return on plan assets: |  |
Assets sold during the year | 0 | 0
Assets still held at year end | 0.2 | 0
Net purchases, sales and settlements | 0.1 | 0.2
Balance at end of period | 0.6 | 0.3
Other plan assets | Level 1 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 40.2 | 28.6
Other plan assets | Level 2 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | 2.5 | 5.5
Other plan assets | Level 3 |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |
Fair Value of Plan Assets | $ 0.6 | $ 0.3

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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 Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -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 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&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 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 + Details
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