Investments - Schedule of Investments (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Securities	$ 4,782.4	$ 4,475.3
Available-for-sale Securities, Equity Securities	360.8	550.4
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	466.7
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	90.3
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	942.2
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	2,978.3
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	304.9
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	355.5	617.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(21.1)	(21.5)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	90.8	122.2
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(7.4)	(12.7)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	446.3	740.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(28.5)	(34.2)
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Related to Securities that have Previously Recognized Foregin Currency Impairment	0.1	(0.1)
Number of Issuers of Available for Sales Securities Continuous Unrealized Loss Possition Aggregate Losses Related to Securities that have Previously Recognized Foreign Currency impairment	1	1
Percentage of Unrealized Loss Postion to Amortized Cost Basis of Available for Sale Security Average		4.00%
Accrued Expenses and Other Liabilities	390.7	437.8
External Credit Rating, Investment Grade [Member] \| Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	4.8	(28.1)
External Credit Rating, Non Investment Grade [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Related to Securities that have Previously Recognized Foregin Currency Impairment	0.1	(0.1)
Percentage of Unrealized Loss Postion to Amortized Cost Basis of Available for Sale Security Average	5.00%
External Credit Rating, Non Investment Grade [Member] \| Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	7.3	(4.1)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	22.2	103.2
Available-for-sale Securities, Gross Unrealized Losses	(16.4)	(2.0)
Available-for-sale Securities, Equity Securities	360.8	550.4
Available-for-sale Equity Securities, Amortized Cost Basis	355.0	449.2
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	176.3	20.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(15.3)	(0.8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	6.5	13.2
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(1.1)	(1.2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	182.8	33.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(16.4)	(2.0)
Preferred Stock Finance Insurance and Real Estate [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	0.8	3.5
Available-for-sale Securities, Gross Unrealized Losses	(6.3)	(0.2)
Available-for-sale Securities, Equity Securities	88.9	97.7
Available-for-sale Equity Securities, Amortized Cost Basis	94.4	94.4
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	52.4	3.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(5.6)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2.1	2.6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(0.7)	(0.2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	54.5	5.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(6.3)	(0.2)
Preferred Stocks Other Industries [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	2.6	7.6
Available-for-sale Securities, Gross Unrealized Losses	(0.7)	(0.2)
Available-for-sale Securities, Equity Securities	20.2	27.4
Available-for-sale Equity Securities, Amortized Cost Basis	18.3	20.0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3.2	0.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(0.6)	(0.1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2.8	2.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(0.1)	(0.1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	6.0	3.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(0.7)	(0.2)
Common Stock Intermec [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains		50.6
Available-for-sale Securities, Gross Unrealized Losses		0
Available-for-sale Securities, Equity Securities		137.5
Available-for-sale Equity Securities, Amortized Cost Basis		86.9
Common Stocks Manufacturing [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	9.6	14.6
Available-for-sale Securities, Gross Unrealized Losses	(0.9)	(0.3)
Available-for-sale Securities, Equity Securities	72.3	89.6
Available-for-sale Equity Securities, Amortized Cost Basis	63.6	75.3
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	11.2	7.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(0.9)	(0.3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	1.7
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	11.2	9.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(0.9)	(0.3)
Common Stocks Other Industries [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	4.0	6.6
Available-for-sale Securities, Gross Unrealized Losses	(2.8)	(0.1)
Available-for-sale Securities, Equity Securities	41.5	43.8
Available-for-sale Equity Securities, Amortized Cost Basis	40.3	37.3
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	15.7	6.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(2.8)	(0.1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	15.7	6.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(2.8)	(0.1)
Exchange Traded Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	0.1	2.7
Available-for-sale Securities, Gross Unrealized Losses	(0.4)	0
Available-for-sale Securities, Equity Securities	65.7	79.2
Available-for-sale Equity Securities, Amortized Cost Basis	66.0	76.5
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	50.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(0.4)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	50.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(0.4)
Partnership Interest [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	5.1	17.6
Available-for-sale Securities, Gross Unrealized Losses	(5.3)	(1.2)
Available-for-sale Securities, Equity Securities	72.2	75.2
Available-for-sale Equity Securities, Amortized Cost Basis	72.4	58.8
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	43.3	2.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(5.0)	(0.3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1.6	6.1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(0.3)	(0.9)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	44.9	8.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(5.3)	(1.2)
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	507.4	266.7
Available-for-sale Securities, Gross Unrealized Losses	(12.1)	(32.2)
Available-for-sale Securities, Debt Securities	4,782.4	4,475.3
Available-for-sale Debt Securities, Amortized Cost Basis	4,287.1	4,240.8
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	179.2	597.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(5.8)	(20.7)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	84.3	109.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(6.3)	(11.5)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	263.5	706.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(12.1)	(32.2)
Accrued Expenses and Other Liabilities	4.9	0
US Government and Government Agencies and Authorities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	52.0	28.4
Available-for-sale Securities, Gross Unrealized Losses	0	(0.1)
Available-for-sale Securities, Debt Securities	516.7	536.9
Available-for-sale Debt Securities, Amortized Cost Basis	464.7	508.6
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1.3	18.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	(0.1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0.1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1.3	18.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	0	(0.1)
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	268.2
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	30.1
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	0.9
Other Issuers [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	5.7
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	143.1	53.5
Available-for-sale Securities, Gross Unrealized Losses	(0.8)	(20.7)
Available-for-sale Securities, Debt Securities	1,903.3	1,792.8
Available-for-sale Debt Securities, Amortized Cost Basis	1,761.0	1,760.0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	455.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	(16.9)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	12.3	16.5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(0.8)	(3.8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	12.3	472.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(0.8)	(20.7)
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	307.8	178.8
Available-for-sale Securities, Gross Unrealized Losses	(10.3)	(10.1)
Available-for-sale Securities, Debt Securities	2,275.2	2,049.0
Available-for-sale Debt Securities, Amortized Cost Basis	1,977.7	1,880.3
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	176.9	123.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(5.5)	(3.7)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	67.4	87.8
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(4.8)	(6.4)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	244.3	210.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(10.3)	(10.1)
Redeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	3.4	4.9
Available-for-sale Securities, Gross Unrealized Losses	(0.3)	0
Available-for-sale Securities, Debt Securities	81.5	88.3
Available-for-sale Debt Securities, Amortized Cost Basis	78.4	83.4
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1.0	0.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(0.3)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1.7	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2.7	0.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(0.3)	0
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gains	1.1	1.1
Available-for-sale Securities, Gross Unrealized Losses	(0.7)	(1.3)
Available-for-sale Securities, Debt Securities	5.7	8.3
Available-for-sale Debt Securities, Amortized Cost Basis	5.3	8.5
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2.9	4.6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(0.7)	(1.3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2.9	4.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(0.7)	(1.3)
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Securities	1.8	1.9
Other Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Securities	0.6	1.2
Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Securities	3.2	5.0
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Securities	$ 0.1	$ 0.2

Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Related to Securities that have Previously Recognized Foregin Currency Impairment

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