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Schedule II - Condensed Financial Information of Registrant Statements of Income (details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues:                      
Investment income from subsidiaries                 $ 388.6 $ 345.5 $ 318.7
Total revenues $ 1,480.2 $ 1,545.7 $ 1,410.0 $ 1,330.2 $ 1,375.0 $ 1,391.0 $ 1,333.9 $ 1,430.6 5,766.1 5,530.7 5,442.7
Expenses:                      
Federal income taxes (credits)                 209.6 199.7 225.0
Net Income (Loss) $ 90.6 $ 125.9 $ 102.0 $ 103.4 $ 63.3 $ 85.8 $ 66.1 $ 194.4 422.1 409.7 447.8
Parent Company [Member]                      
Revenues:                      
Investment income from subsidiaries                 61.2 44.7 38.1
Real estate and other income                 4.6 4.5 4.4
Other investment income                 0.4 0.3 0.8
Total revenues                 66.3 49.6 43.3
Expenses:                      
Interest - subsidiaries                 0.4 0.8 1.3
Interest - other                 42.9 28.3 23.1
Real estate and other expenses                 3.7 4.3 4.3
General expenses, taxes and fees                 10.1 9.3 11.6
Total expenses                 57.3 42.9 40.5
Revenues, net of expenses                 8.9 6.6 2.7
Federal income taxes (credits)                 2.7 (1.3) 0.3
Income (loss) before equity in earnings (losses) of subsidiaries                 6.2 8.0 2.4
Dividends received                 326.0 281.1 205.3
Earnings (losses) in excess of dividends                 89.8 120.5 240.1
Net Income (Loss)                 $ 422.1 $ 409.7 $ 447.8