Fair Value Level 3 Financial Instruments Measured at Fair Value on a Non-recurring Basis (Details) - Portion at Other than Fair Value Measurement [Member] - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage Loans on Real Estate, current year impairment	$ 1.0
Mortgage Loans on Real Estate, Period Increase (Decrease)	$ (0.2)