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Benefit Plans (Allocation of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted average asset allocations | 100.00% | 100.00%
Fair value of pension plan assets | $ 284.7 | $ 251.0
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | 283.5 | 249.7
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | 1.2 | 1.3
Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets |  |
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted average asset allocations | 66.00% | 65.00%
Target allocation | 65.00% |
Allocation range minimum | 60.00% |
Allocation range maximum | 70.00% |
Indexed Mutual Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | 132.6 | 111.4
Indexed Mutual Funds [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | 132.6 | 111.4
International Mutual Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | 55.4 | 49.6
International Mutual Funds [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | 55.4 | 49.6
Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted average asset allocations | 32.00% | 34.00%
Target allocation | 35.00% |
Allocation range minimum | 30.00% |
Allocation range maximum | 40.00% |
Other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted average asset allocations | 2.00% | 1.00%
Target allocation | 0.00% |
Allocation range minimum | 0.00% |
Allocation range maximum | 5.00% |
Cash [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | 1.0 |
Cash [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | 1.0 |
Mutual Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | 87.4 | 83.8
Mutual Funds [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | 87.4 | 83.8
Insurance Contract [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | 1.2 | 1.3
Insurance Contract [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | 1.2 | 1.3
Balanced Mutual Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | 7.1 | 4.9
Balanced Mutual Fund [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension plan assets | $ 7.1 | $ 4.9

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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 Target allocation of investments of this type to total plan assets presented on a weighted average basis. + 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)(i) -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)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + 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)(i) -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)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis. + 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)(i) -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)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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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 + Details
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