Employee Share-Based Incentive Compensation Plans (Restricted) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended					0 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Restricted Stock [Member]	Mar. 31, 2013 Restricted Stock [Member]	Mar. 31, 2014 Awards Issued in 2012 [Member] Restricted Stock [Member]	May 25, 2011 Chief Executive Officer [Member] Awards Issued in 2011 [Member] Restricted Stock [Member]	Mar. 31, 2014 Chief Executive Officer [Member] Awards Issued in 2011 [Member] Restricted Stock [Member]
Employee Share-Based Incentive Compensation Plans
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms			2 years 6 months 0 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested			$ 4.3	$ 0.1
Activity in plan
Beginning of period (in shares)			915,000	927,000
New awards (in shares)			0	0		630,000
Forfeitures (in shares)			(2,500)	0
Vested (in shares)			(300,000)	(9,000)	(142,500)		(157,500)
End of period (in shares)			612,500	918,000	140,000		472,500
Unamortized grant date fair value
Unamortized grant date fair value, beginning of period			6.5	9.6
Issued			0	0
Expense recognized	(1.4)	(1.2)	(0.8)	(0.8)
Unamortized grant date fair value, end of period			$ 5.7	$ 8.8