Employee Benefit Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014 item	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock plans	2
Shares available for grant	6,500,000
Stock option grants	0	0
Compensation cost related to restricted shares	$ 1.7	$ 3.4
Deferred compensation arrangement, award vesting period	3 years		3 years	3 years	5 years
Deferred compensation arrangement, cash awards granted, amount	8.9		8.4
Deferred compensation arrangement, compensation expense	1.7	2.5
Deferred compensation cash-based arrangement, liability	7.4		14.8
Percentage of share of non vested stock considered as call option	85.00%
Percentage of share of non-vested stock considered as put-option	15.00%
Segment, Discontinued Operations [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to restricted shares		1.3
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement, award vesting period	3 years
E S P P [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance	1,500,000
Shares available for grant	1,300,000
Allocated share-based compensation expense	0.2	0.2
Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement, compensation expense	0.9	1.6
Deferred compensation cash-based arrangement, liability	$ 5.3		$ 11.1
Maximum Shares As Incentive Options Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	2,000,000