Fair Value (Assets Measured At Fair Value On A Nonrecurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Assets measured at fair value on a nonrecurring basis during the period and still held as of the balance sheet date	$ 59.3	$ 66.3
Level 1 [Member]
Assets measured at fair value on a nonrecurring basis during the period and still held as of the balance sheet date	0.0	0.0
Level 2 [Member]
Assets measured at fair value on a nonrecurring basis during the period and still held as of the balance sheet date	0.0	0.0
Level 3 [Member]
Assets measured at fair value on a nonrecurring basis during the period and still held as of the balance sheet date	59.3	66.3
Commercial Mortgage Loans [Member]
Assets measured at fair value on a nonrecurring basis during the period and still held as of the balance sheet date	55.8	56.0
Commercial Mortgage Loans [Member] | Level 1 [Member]
Assets measured at fair value on a nonrecurring basis during the period and still held as of the balance sheet date	0.0	0.0
Commercial Mortgage Loans [Member] | Level 2 [Member]
Assets measured at fair value on a nonrecurring basis during the period and still held as of the balance sheet date	0.0	0.0
Commercial Mortgage Loans [Member] | Level 3 [Member]
Assets measured at fair value on a nonrecurring basis during the period and still held as of the balance sheet date	55.8	56.0
Real Estate Owned [Member]
Assets measured at fair value on a nonrecurring basis during the period and still held as of the balance sheet date	3.5	10.3
Real Estate Owned [Member] | Level 1 [Member]
Assets measured at fair value on a nonrecurring basis during the period and still held as of the balance sheet date	0.0	0.0
Real Estate Owned [Member] | Level 2 [Member]
Assets measured at fair value on a nonrecurring basis during the period and still held as of the balance sheet date	0.0	0.0
Real Estate Owned [Member] | Level 3 [Member]
Assets measured at fair value on a nonrecurring basis during the period and still held as of the balance sheet date	$ 3.5	$ 10.3