Closed Block - Change in Maximum Future Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in maximum future earnings of the Closed Block
Maximum future earnings to be recognized from Closed Block assets and liabilities, Beginning of year	$ 648.9	$ 685.3	$ 723.8
Maximum future earnings to be recognized from Closed Block assets and liabilities, End of year	596.4	648.9	685.3
Closed Block revenues, net of Closed Block expenses, income taxes and funding adjustment charges	$ (52.5)	$ (36.4)	$ (38.5)