Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2016	Dec. 31, 2015
Available-for-sale Securities Including Securities Pledged [Line Items]
Impairment of Real Estate	$ 0.0
Embedded Derivatives	22.1	$ 23.4
OTTI	15.7	16.9
Securities pledged, Amortized Cost	605.8	252.3
Equity securities, cost	67.8	116.7
Equity securities, available-for-sale	84.4	131.3
Total fixed maturities and equity securities, Amortized Cost	23,003.0	21,661.8
Gross Unrealized Capital Gains	1,930.8	990.8
Gross Unrealized Capital Losses	96.8	535.1
Fair Value	24,859.1	22,140.9
U.S. Treasuries
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	625.4	616.6
Fixed maturities, Gross Unrealized Capital Gains	161.1	105.1
Fixed maturities, Gross Unrealized Capital Losses	0.1	0.3
Embedded Derivatives	0.0	0.0
Fixed maturities, including securities pledged, Fair Value	786.4	721.4
OTTI	0.0	0.0
U.S. government agencies and authorities
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	4.0	4.3
Fixed maturities, Gross Unrealized Capital Gains	0.1	0.0
Fixed maturities, Gross Unrealized Capital Losses	0.0	0.0
Embedded Derivatives	0.0	0.0
Fixed maturities, including securities pledged, Fair Value	4.1	4.3
OTTI	0.0	0.0
State, municipalities and political subdivisions
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	765.8	589.9
Fixed maturities, Gross Unrealized Capital Gains	58.8	13.8
Fixed maturities, Gross Unrealized Capital Losses	1.1	7.9
Embedded Derivatives	0.0	0.0
Fixed maturities, including securities pledged, Fair Value	823.5	595.8
OTTI	0.0	0.0
U.S. corporate public securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	9,493.0	9,472.4
Fixed maturities, Gross Unrealized Capital Gains	947.5	384.9
Fixed maturities, Gross Unrealized Capital Losses	24.3	256.8
Embedded Derivatives	0.0	0.0
Fixed maturities, including securities pledged, Fair Value	10,416.2	9,600.5
OTTI	1.3	1.4
U.S. corporate private securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	2,677.1	2,336.0
Fixed maturities, Gross Unrealized Capital Gains	182.2	86.3
Fixed maturities, Gross Unrealized Capital Losses	26.3	62.4
Embedded Derivatives	0.0	0.0
Fixed maturities, including securities pledged, Fair Value	2,833.0	2,359.9
OTTI	0.0	0.0
Foreign corporate public securities and foreign governments
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	2,813.8	2,868.7
Fixed maturities, Gross Unrealized Capital Gains	213.3	95.0
Fixed maturities, Gross Unrealized Capital Losses	34.8	151.5
Embedded Derivatives	0.0	0.0
Fixed maturities, including securities pledged, Fair Value	2,992.3	2,812.2
OTTI	0.0	0.0
Foreign corporate private securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	2,756.5	2,678.8
Fixed maturities, Gross Unrealized Capital Gains	192.0	96.1
Fixed maturities, Gross Unrealized Capital Losses	5.7	63.5
Embedded Derivatives	0.0	0.0
Fixed maturities, including securities pledged, Fair Value	2,942.8	2,711.4
OTTI	0.0	0.0
Residential mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	2,723.2	1,761.1
Fixed maturities, Gross Unrealized Capital Gains	166.8	151.6
Fixed maturities, Gross Unrealized Capital Losses	5.9	6.9
Embedded Derivatives	22.1	23.4
Fixed maturities, including securities pledged, Fair Value	2,906.2	1,929.2
OTTI	5.5	6.4
Residential mortgage-backed securities agency
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	2,393.7	1,579.5
Fixed maturities, Gross Unrealized Capital Gains	112.1	105.3
Fixed maturities, Gross Unrealized Capital Losses	3.5	4.8
Embedded Derivatives	11.9	12.8
Fixed maturities, including securities pledged, Fair Value	2,514.2	1,692.8
OTTI	0.0	0.0
Residential mortgage-backed securities non-agency
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	329.5	181.6
Fixed maturities, Gross Unrealized Capital Gains	54.7	46.3
Fixed maturities, Gross Unrealized Capital Losses	2.4	2.1
Embedded Derivatives	10.2	10.6
Fixed maturities, including securities pledged, Fair Value	392.0	236.4
OTTI	5.5	6.4
Commercial mortgage-backed
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	1,344.5	1,228.9
Fixed maturities, Gross Unrealized Capital Gains	114.4	49.5
Fixed maturities, Gross Unrealized Capital Losses	0.2	3.5
Embedded Derivatives	0.0	0.0
Fixed maturities, including securities pledged, Fair Value	1,458.7	1,274.9
OTTI	6.7	6.7
Other asset-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	337.7	240.7
Fixed maturities, Gross Unrealized Capital Gains	13.5	9.9
Fixed maturities, Gross Unrealized Capital Losses	1.1	1.4
Embedded Derivatives	0.0	0.0
Fixed maturities, including securities pledged, Fair Value	350.1	249.2
OTTI	2.2	2.4
Fixed maturities
Available-for-sale Securities Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost	23,541.0	21,797.4
Fixed maturities, Gross Unrealized Capital Gains	2,049.7	992.2
Fixed maturities, Gross Unrealized Capital Losses	99.5	554.2
Embedded Derivatives	22.1	23.4
Fixed maturities, including securities pledged, Fair Value	25,513.3	22,258.8
OTTI	15.7	16.9
Securities pledged, Amortized Cost	605.8	252.3
Securities pledged, Gross Unrealized Capital Gains	135.5	16.0
Securities pledged, Gross Unrealized Capital Losses	2.7	19.1
Securities pledged, Gross Unrealized Capital Losses	738.6	249.2
Total fixed maturities, less securities pledged, Amortized Cost	22,935.2	21,545.1
Total fixed maturities, less securities pledged, Gross Unrealized Capital Gains	1,914.2	976.2
Total fixed maturities, less securities pledged, Gross Unrealized Capital Losses	96.8	535.1
Total fixed maturities, less securities pledged, Fair Value	24,774.7	22,009.6
Equity securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Embedded Derivatives	0.0	0.0
OTTI	0.0	0.0
Equity securities, cost	67.8	116.7
Available-for-sale Equity Securities, Gross Unrealized Gain Accumulated In Investments	16.6	14.6
Available-for-sale Equity Securities, Gross Unrealized Loss Accumulated In Investments	0.0	0.0
Equity securities, available-for-sale	84.4	131.3
Impaired available-for-sale securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Net unrealized gains on impaired available-for-sale securities	$ 255.4	$ 209.2

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as an asset.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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Available-for-sale, Less Securities Pledged, Debt Securities, Amortized Cost Basis

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Available-for-sale Securities, Including Securities Pledged [Line Items]

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Available-for-sale Securities, Less Securities Pledged, Debt Securities, Fair Value Disclosure

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Available-for-sale Securities, Less Securities Pledged, Debt Securities, Unrecognized Holding Gain

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Available-for-sale Securities, Other than Temporary Impairment, Noncredit Losses Recognized as a Component of Other Comprehensive Income

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This item represents the cost of debt and equity securities pledged as collateral, which are categorized neither as held-to-maturity nor trading, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any.

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Available-for-sale Securities, Pledged as Collateral, Debt Securities, Fair Value

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Available-for-sale Securities, Pledged as Collateral, Debt Securities, Unrecognized Holding Gain

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Available-for-sale Securities, Less Securities Pledged, Debt Securities, Unrecognized Holding Loss

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Available-for-sale Securities, Pledged as Collateral, Debt Securities, Unrecognized Holding Loss

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