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Investments - Unrealized Gains and Gross Unrealized Losses in Investment in Equity Securities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities at Cost | $ 0.0 | $ 476.2
Equity Securities at Fair Value | $ 684.4 | 526.0
Exchange Traded Funds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities at Cost |  | 207.6
Equity Securities at Fair Value |  | 219.5
Limited Liability Companies and Limited Partnerships [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities at Cost |  | 184.9
Equity Securities at Fair Value |  | 202.9
Finance, Insurance and Real Estate [Member] | Preferred Stock [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities at Cost |  | 51.1
Equity Securities at Fair Value |  | 55.7
Finance, Insurance and Real Estate [Member] | Common Stock [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities at Cost |  | 5.5
Equity Securities at Fair Value |  | 7.1
All Industries Other than Finance, Insurance and Real Estate [Member] | Preferred Stock [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities at Cost |  | 17.1
Equity Securities at Fair Value |  | 23.1
All Industries Other than Finance, Insurance and Real Estate [Member] | Common Stock [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity Securities at Cost |  | 10.0
Equity Securities at Fair Value |  | $ 17.7

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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 No definition available. + Details
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