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Schedule 2 - Parent Company Financial Statements - Statements of Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]                      
Net Income $ 55.2 $ 70.1 $ 34.0 $ 58.4 $ 1.9 $ 55.6 $ 2.3 $ 43.6 $ 217.7 $ 103.4 $ 74.5
Unrealized Holding Gains (Losses) Arising During the Year:                      
Securities Held by Parent                 (324.9) 157.9 232.1
Reclassification Adjustment for Amounts Included in Net Income:                      
Securities Held by Parent                 (37.9) (61.2) (30.9)
Unrealized Holding Gains (Losses)                 362.8 (96.7) (201.2)
Unrecognized Postretirement Benefit Costs Arising During the Year                 61.6 (29.4) (53.9)
Net Unrecognized Postretirement Benefit Costs                 86.6 (13.2) (45.2)
Foreign Currency Translation Adjustments                 0.2 1.6 0.4
Reclassification Adjustment for Amounts Included in Net Income                 0 0 0
Foreign Currency Translation Adjustments                 0.2 1.6 0.4
Other Comprehensive Income (Loss) Before Income Taxes                 (276.0) 85.1 156.4
Income Tax Benefit (Expense):                      
Securities Held by Parent                 (115.9) 55.9 82.5
Securities Held by Parent                 (13.2) (21.5) (10.9)
Unrealized Holding Gains and Losses                 129.1 (34.4) (71.6)
Unrecognized Postretirement Benefit Costs Arising During the Year                 (21.6) 10.3 19.0
Net Unrecognized Postretirement Benefit Costs                 (30.4) 4.6 15.9
Foreign Currency Translation Adjustments                 (0.1) (0.6) (0.1)
Reclassification Adjustment for Amounts Included in Net Income                 0 0 0
Foreign Currency Translation Adjustment                 (0.1) (0.6) (0.1)
Other Comprehensive Income Tax Benefit (Expense)                 98.6 (30.4) (55.8)
Other Comprehensive Income (Loss)                 (177.4) 54.7 100.6
Parent Company [Member]
                      
Condensed Financial Statements, Captions [Line Items]                      
Net Income                 217.7 103.4 74.5
Unrealized Holding Gains (Losses) Arising During the Year:                      
Securities Held by Subsidiaries                 (324.9) 157.9 231.5
Securities Held by Parent                 0 0 0.6
Reclassification Adjustment for Amounts Included in Net Income:                      
Securities Held by Subsidiaries                 (37.9) (61.2) (30.2)
Securities Held by Parent                 0 0 (0.7)
Unrealized Holding Gains (Losses)                 362.8 (96.7) (201.2)
Unrecognized Postretirement Benefit Costs Arising During the Year                 61.6 (29.4) (53.9)
Amortization of Unrecognized Postretirement Benefit Costs                 25.0 16.2 8.7
Net Unrecognized Postretirement Benefit Costs                 86.6 (13.2) (45.2)
Foreign Currency Translation Adjustments                 0.2 1.6 0.4
Reclassification Adjustment for Amounts Included in Net Income                 0 0 0
Foreign Currency Translation Adjustments                 0.2 1.6 0.4
Other Comprehensive Income (Loss) Before Income Taxes                 (276.0) 85.1 156.4
Income Tax Benefit (Expense):                      
Securities Held by Subsidiaries                 115.9 (55.9) (82.3)
Securities Held by Parent                 0 0 0.2
Securities Held by Subsidiaries                 13.2 21.5 10.7
Securities Held by Parent                 0 0 (0.2)
Unrealized Holding Gains and Losses                 129.1 (34.4) (71.6)
Unrecognized Postretirement Benefit Costs Arising During the Year                 (21.6) 10.3 19.0
Amortization of Unrecognized Postretirement Benefit Costs                 (8.8) (5.7) (3.1)
Net Unrecognized Postretirement Benefit Costs                 (30.4) 4.6 15.9
Foreign Currency Translation Adjustments                 (0.1) (0.6) (0.1)
Reclassification Adjustment for Amounts Included in Net Income                 0 0 0
Foreign Currency Translation Adjustment                 (0.1) (0.6) (0.1)
Other Comprehensive Income Tax Benefit (Expense)                 98.6 (30.4) (55.8)
Other Comprehensive Income (Loss)                 (177.4) 54.7 100.6
Total Comprehensive Income                 $ 40.3 $ 158.1 $ 175.1