Schedule II - Condensed Financial Information of Registrant Statements of Income (Details) - USD ($) $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2020		Sep. 30, 2020		Jun. 30, 2020		Mar. 31, 2020		Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Revenues:
Investment income from subsidiaries																	$ 438.9		$ 450.7		$ 431.8
Realized Investment Gains Losses From Sales																	14.2		38.6		58.2
Total revenues	$ 2,423.2	[1]	$ 1,951.7	[1]	$ 2,027.0	[1]	$ 764.0	[1]	$ 2,001.9	[1]	$ 1,844.0	[1]	$ 1,700.0	[1]	$ 1,914.4	[1]	7,166.0	[2]	7,460.5	[2]	6,258.8	[2]
Expenses:
Federal income taxes (credits)																	129.7		265.9		67.5
Net Income (Loss)	$ 519.7		$ 246.0		$ 397.7		$ (604.8)		$ 275.8		$ 202.8		$ 165.5		$ 412.2		558.6		1,056.4		370.5
Parent Company [Member]
Revenues:
Investment income from subsidiaries																	89.5		105.1		101.7
Real estate and other income																	4.6		5.0		5.0
Other investment income																	0.4		0.9		2.0
Realized Investment Gains Losses From Sales																	0.0		(0.2)		0.0
Total revenues																	94.7		110.9		108.9
Expenses:
Interest - subsidiaries																	3.8		3.1		2.1
Interest - other																	42.3		42.9		47.0
Real estate and other expenses																	4.8		4.7		4.6
General expenses, taxes and fees																	14.6		13.4		15.3
Total expenses																	65.7		64.3		69.1
Revenues, net of expenses																	29.0		46.6		39.7
Federal income taxes (credits)																	5.0		8.8		1.5
Income (loss) before equity in earnings (losses) of subsidiaries																	23.9		37.7		38.2
Dividends received																	472.4		411.8		412.3
Earnings (losses) in excess of dividends																	62.3		606.9		(80.0)
Net Income (Loss)																	$ 558.6		$ 1,056.4		$ 370.5

[1] Reclassification adjustments were made to certain Title segment revenues and expenses in prior periods to conform to the presentation adopted in the fourth quarter 2020. See Note 1(c).

[2] (d)    Reclassification adjustments were made to certain Title segment revenues and expenses in prior periods to conform to the presentation adopted in 2020. See Note 1(c).