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Investments - Unrealized Gains and Gross Unrealized Losses in Investment in Equity Securities (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | $ 486.9 | $ 561.5
Gross Unrealized Gains | 43.3 | 75.7
Gross Unrealized Losses | (7.0) | (5.0)
Equity Securities at Fair Value | 523.2 | 632.2
Exchange Traded Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 179.7 | 195.2
Gross Unrealized Gains | 1.1 | 8.2
Gross Unrealized Losses | (3.7) | (0.7)
Equity Securities at Fair Value | 177.1 | 202.7
Limited Liability Companies and Limited Partnerships [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 181.0 | 160.3
Gross Unrealized Gains | 25.0 | 27.7
Gross Unrealized Losses | (0.5) | (1.8)
Equity Securities at Fair Value | 205.5 | 186.2
Finance, Insurance and Real Estate [Member] | Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 80.8 | 85.5
Gross Unrealized Gains | 4.9 | 5.2
Gross Unrealized Losses | (0.8) | (1.0)
Equity Securities at Fair Value | 84.9 | 89.7
Finance, Insurance and Real Estate [Member] | Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 18.9 | 34.3
Gross Unrealized Gains | 5.3 | 6.2
Gross Unrealized Losses | (1.0) | 0.0
Equity Securities at Fair Value | 23.2 | 40.5
All Industries Other than Finance, Insurance and Real Estate [Member] | Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 17.1 | 16.3
Gross Unrealized Gains | 2.7 | 3.5
Gross Unrealized Losses | (0.8) | 0.0
Equity Securities at Fair Value | 19.0 | 19.8
All Industries Other than Finance, Insurance and Real Estate [Member] | Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 9.4 |
Gross Unrealized Gains | 4.3 |
Gross Unrealized Losses | (0.2) |
Equity Securities at Fair Value | $ 13.5 |
Manufacturing [Member] | Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost |  | 43.4
Gross Unrealized Gains |  | 14.9
Gross Unrealized Losses |  | (1.1)
Equity Securities at Fair Value |  | 57.2
All Industries Other than Manufacturing and Finance, Insurance and Real Estate [Member] | Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost |  | 26.5
Gross Unrealized Gains |  | 10.0
Gross Unrealized Losses |  | (0.4)
Equity Securities at Fair Value |  | $ 36.1

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + 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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