Employee Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Mar. 31, 2013 Segment, Discontinued Operations [Member]	Sep. 30, 2013 Executive Officer [Member]	Sep. 30, 2012 Executive Officer [Member]	Sep. 30, 2013 Executive Officer [Member]	Sep. 30, 2012 Executive Officer [Member]	Dec. 31, 2012 Executive Officer [Member]	Sep. 30, 2013 Maximum Shares As Incentive Options Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Of Share Of Non Vested Stock Considered As Call Option	85.00%		85.00%
Percentage of share of non-vested stock considered as put-option			15.00%
Stock Authorized Shares Employee Stock Purchase Plans			1.5
Available Shares Employee Stock Purchase Plan			1.3
Shares available for grant	6.5		6.5									2.0
Compensation cost related to restricted shares	$ 1.6	$ 1.8	$ 6.7	$ 5.5		$ 1.3
Allocated Share-based Compensation Expense	0.2	0.1	0.6	0.1
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Amount	5.9		5.9		4.2
Deferred Compensation Arrangement with Individual, Compensation Expense	3.3	2.5	7.5	6.1			2.1	2.2	4.4	5.1
Deferred Compensation Cash-based Arrangements, Liability, Current	$ 13.2		$ 13.2		$ 13.0		$ 10.2		$ 10.2		$ 11.7