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Investments (Equity Securities) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Cost | $ 476.2 | $ 0.0
Gross Unrealized, Gains | 56.2 |
Gross Unrealized Losses | (6.4) |
Fair Value | 526.0 | $ 684.4
Less than Twelve Months, Fair Value | 50.9 |
Twelve Months or Longer, Fair Value | 8.6 |
Fair Value | 59.5 |
Less than 12 Months, Accumulated Loss | (2.5) |
12 Months or Longer, Accumulated Loss | (3.9) |
Unrealized Losses | (6.4) |
Exchange Traded Funds [Member] |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Cost | 207.6 |
Gross Unrealized, Gains | 11.9 |
Gross Unrealized Losses | 0.0 |
Fair Value | 219.5 |
Limited Liability Companies and Limited Partnerships [Member] |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Cost | 184.9 |
Gross Unrealized, Gains | 23.9 |
Gross Unrealized Losses | (5.9) |
Fair Value | 202.9 |
Less than Twelve Months, Fair Value | 48.4 |
Twelve Months or Longer, Fair Value | 7.7 |
Fair Value | 56.1 |
Less than 12 Months, Accumulated Loss | (2.1) |
12 Months or Longer, Accumulated Loss | (3.8) |
Unrealized Losses | (5.9) |
Finance, Insurance and Real Estate [Member] | Preferred Stock [Member] |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Cost | 51.1 |
Gross Unrealized, Gains | 4.6 |
Gross Unrealized Losses | 0.0 |
Fair Value | 55.7 |
Less than Twelve Months, Fair Value | 0.3 |
Twelve Months or Longer, Fair Value | 0.2 |
Fair Value | 0.5 |
Less than 12 Months, Accumulated Loss | 0.0 |
12 Months or Longer, Accumulated Loss | 0.0 |
Unrealized Losses | 0.0 |
Finance, Insurance and Real Estate [Member] | Common Stock [Member] |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Cost | 5.5 |
Gross Unrealized, Gains | 1.7 |
Gross Unrealized Losses | (0.1) |
Fair Value | 7.1 |
Less than Twelve Months, Fair Value | 1.6 |
Twelve Months or Longer, Fair Value | 0.0 |
Fair Value | 1.6 |
Less than 12 Months, Accumulated Loss | (0.1) |
12 Months or Longer, Accumulated Loss | 0.0 |
Unrealized Losses | (0.1) |
All Industries Other than Finance, Insurance and Real Estate [Member] | Preferred Stock [Member] |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Cost | 17.1 |
Gross Unrealized, Gains | 6.0 |
Gross Unrealized Losses | 0.0 |
Fair Value | 23.1 |
Less than Twelve Months, Fair Value | 0.2 |
Twelve Months or Longer, Fair Value | 0.2 |
Fair Value | 0.4 |
Less than 12 Months, Accumulated Loss | 0.0 |
12 Months or Longer, Accumulated Loss | 0.0 |
Unrealized Losses | 0.0 |
All Industries Other than Finance, Insurance and Real Estate [Member] | Common Stock [Member] |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Cost | 10.0 |
Gross Unrealized, Gains | 8.1 |
Gross Unrealized Losses | (0.4) |
Fair Value | 17.7 |
Less than Twelve Months, Fair Value | 0.4 |
Twelve Months or Longer, Fair Value | 0.5 |
Fair Value | 0.9 |
Less than 12 Months, Accumulated Loss | (0.3) |
12 Months or Longer, Accumulated Loss | (0.1) |
Unrealized Losses | $ (0.4) |

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