Insurance Expenses (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Insurance Expenses [Abstract]
Commissions									$ 399.2	$ 357.6	$ 324.6
General Expenses									209.0	241.1	258.1
Taxes, Licenses and Fees									48.8	44.2	38.9
Total Costs Incurred									657.0	642.9	621.6
Policy Acquisition Costs:
Deferred									(314.9)	(270.6)	(235.8)
Amortized									299.3	257.4	235.4
Net Policy Acquisition Costs Deferred									(15.6)	(13.2)	(0.4)
Life VIF, P&C VIF and P&C Customer Relationships Amortized									5.9	15.4	7.2
Insurance Expenses	$ 158.5	$ 161.7	$ 167.8	$ 159.3	$ 177.0	$ 161.1	$ 162.1	$ 144.9	$ 647.3	$ 645.1	$ 628.4