Sales Inducements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Changes in Deferred Sales Inducement Activity:
Balance, beginning of period	$ 75.7	$ 60.9
Sales inducements deferred	2.1	2.8
Amortization charged to income	(0.7)	(0.7)
Offsets to net unrealized investment gains or losses included in AOCI	(3.2)	1.3
Balance, end of period	$ 73.9	$ 64.3