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Pension Benefits - Changes in Fair Value of Pension Plans Level 3 (Details) (Pension Plans, Defined Benefit [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Transfers out of Level 3 |  | $ (1.0)
Fair Value of Plan Assets at End of Year | 524.5 | 457.6
Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair Value of Plan Assets at Beginning of Year | 27.5 | 41.4
Return on Plan Assets Still Held | 3.5 | 1.8
Purchases, Sales and Settlements, Net | 16.4 | (14.7)
Fair Value of Plan Assets at End of Year | 47.4 | 27.5
Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair Value of Plan Assets at Beginning of Year |  | 1.0
Return on Plan Assets Still Held |  | 0
Purchases, Sales and Settlements, Net |  | 0
Transfers out of Level 3 |  | (1.0)
Fair Value of Plan Assets at End of Year |  | 0
Other Equity Interests [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair Value of Plan Assets at Beginning of Year | 26.9 | 37.2
Return on Plan Assets Still Held | 3.5 | 1.7
Purchases, Sales and Settlements, Net | 16.5 | (12.0)
Transfers out of Level 3 |  | 0
Fair Value of Plan Assets at End of Year | 46.9 | 26.9
Receivables and Other [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair Value of Plan Assets at End of Year | 2.8 | 3.1
Receivables and Other [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair Value of Plan Assets at Beginning of Year | 0.6 | 3.2
Return on Plan Assets Still Held | 0 | 0.1
Purchases, Sales and Settlements, Net | (0.1) | (2.7)
Transfers out of Level 3 |  | 0
Fair Value of Plan Assets at End of Year | $ 0.5 | $ 0.6

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- Definition Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date. + 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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- Definition Amount of increase (decrease) in plan assets from purchases, sales and settlement of plan obligations. + 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)(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 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(B) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition Transfers in and out of Level 3. For example, transfers due to changes in the observability of significant inputs. + 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)(C) -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)(C) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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