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Reinsurance - Premium Income Data (Detail) (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
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Premium Income									$ 7,777.3	$ 7,736.0	$ 7,521.5
Reinsurance Assumed									203.2	210.9	216.6
Reinsurance Ceded									(355.8)	(230.8)	(223.9)
Premium Income	1,890.7	1,897.3	1,905.8	1,930.9	1,937.2	1,929.4	1,927.6	1,921.9	7,624.7	7,716.1	7,514.2
Ceded Benefits and Change in Reserves for Future Benefits									$ 728.7	$ 591.7	$ 609.2

Amount of earned premiums ceded to other entities.

Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.