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Investments - Unrealized Gains and Gross Unrealized Losses in Investment in Equity Securities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | $ 476.2 | $ 434.4
Gross Unrealized Gains | 56.2 | 52.9
Gross Unrealized Losses | (6.4) | (5.6)
Equity Securities at Fair Value | 526.0 | 481.7
Exchange Traded Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 207.6 | 136.1
Gross Unrealized Gains | 11.9 | 9.6
Gross Unrealized Losses | 0.0 | (1.3)
Equity Securities at Fair Value | 219.5 | 144.4
Limited Liability Companies and Limited Partnerships [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 184.9 | 183.3
Gross Unrealized Gains | 23.9 | 29.2
Gross Unrealized Losses | (5.9) | (2.9)
Equity Securities at Fair Value | 202.9 | 209.6
Finance, Insurance and Real Estate [Member] | Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 51.1 | 58.1
Gross Unrealized Gains | 4.6 | 2.3
Gross Unrealized Losses | 0.0 | (0.8)
Equity Securities at Fair Value | 55.7 | 59.6
Finance, Insurance and Real Estate [Member] | Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity Securities at Cost | 5.5 | 31.2
Gross Unrealized Gains | 1.7 | 2.3
Gross Unrealized Losses | (0.1) | 0.0
Equity Securities at Fair Value | 7.1 | 33.5
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 | 18.5
Gross Unrealized Gains | 6.0 | 4.9
Gross Unrealized Losses | 0.0 | (0.5)
Equity Securities at Fair Value | 23.1 | 22.9
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 | 10.0 | 7.2
Gross Unrealized Gains | 8.1 | 4.6
Gross Unrealized Losses | (0.4) | (0.1)
Equity Securities at Fair Value | $ 17.7 | $ 11.7

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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=73527792&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=73527792&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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- 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=65884222&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=66010992&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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