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Investments - Unrealized Gains and Gross Unrealized Losses in Investment in Equity Securities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | $ 530.0 | $ 462.7
Gross Unrealized Gains | 74.7 | 62.5
Gross Unrealized Losses | (6.2) | (3.3)
Equity Securities at Fair Value | 598.5 | 521.9
Preferred Stocks Finance, Insurance and Real Estate [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 85.4 | 75.4
Gross Unrealized Gains | 2.9 | 3.9
Gross Unrealized Losses | (2.5) | (0.1)
Equity Securities at Fair Value | 85.8 | 79.2
Preferred Stocks Other Industries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 20.1 | 18.4
Gross Unrealized Gains | 4.4 | 3.8
Gross Unrealized Losses | (0.1) | (0.9)
Equity Securities at Fair Value | 24.4 | 21.3
Common Stocks Manufacturing [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 83.4 | 67.0
Gross Unrealized Gains | 21.3 | 20.9
Gross Unrealized Losses | (0.1) | (0.4)
Equity Securities at Fair Value | 104.6 | 87.5
Common Stock Other Industries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 68.8 | 59.1
Gross Unrealized Gains | 17.0 | 8.1
Gross Unrealized Losses | (0.9) | (0.5)
Equity Securities at Fair Value | 84.9 | 66.7
Exchange Traded Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 122.0 | 119.6
Gross Unrealized Gains | 3.9 | 6.3
Gross Unrealized Losses | (1.0) | 0
Equity Securities at Fair Value | 124.9 | 125.9
Limited Liability Companies and Limited Partnerships [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 150.3 | 123.2
Gross Unrealized Gains | 25.2 | 19.5
Gross Unrealized Losses | (1.6) | (1.4)
Equity Securities at Fair Value | $ 173.9 | $ 141.3

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized loss on investments in available-for-sale equity securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale equity securities impacting investments. + References No definition available. + Details
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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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