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Related Parties (Details) (Director [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Related Party Transaction [Line Items] |  |  |
Related Party Transaction Amount of Assets in Defined Contributions Plans | $ 22.8 | $ 20.4 | $ 19.3
Related Party Transaction Percent of Assets in Defined Contribution Plan Assets | 6.00% | 7.00% | 7.00%
Trinity [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Assets Managed by Investment Advisory Firm under Director's Management | 154.7 | 125.2 | 115.2
Related Party Transaction, Expenses from Transactions with Related Party | 0.4 | 0.3 | 0.3
Pension Plans, Defined Benefit [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | 0.3 | 0.3 | 0.3
Related Party Transaction Amount of Assets Under Management in Defined Benefit Plans | $ 148.6 | $ 120.7 | $ 107.1

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- Definition Amounts Invested in Defined Contribution Plan Mutual Fund Managed by a Director's Investment Advisory Firm + References No definition available. + Details
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- Definition Amounts Invested in Defined Contribution Plan Mutual Fund Managed by a Director's Investment Advisory Frim, Percentage of Total Defined Contribution Plan Investments + References No definition available. + Details
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- Definition Investment Assets Managed by a Directors Investment Advisory Firm + References No definition available. + Details
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- Definition Related Party Transaction Amount of Assets Under Management in Defined Benefit Plans + References No definition available. + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Details
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