Fair Value of Financial Instruments (Schedule of Fair Values of Financial Assets and Liabilities Measured On A Nonrecurring Basis) (Details) (Segment, Discontinued Operations [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Segment, Discontinued Operations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on a nonrecurring basis	$ 29.3	$ 26.3
Liabilities measured at fair value on a nonrecurring basis	$ 9.9	$ 10.7