Income Taxes - Table 1 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 0.7	$ 1.4	$ 1.3
State and local	5.2	(0.8)	1.6
Total current expense (benefit)	5.9	0.6	2.9
Deferred:
Federal	104.2	48.2	(682.2)
State and local	(1.5)	(11.7)	(61.5)
Total deferred expense (benefit)	102.7	36.5	(743.7)
Total income tax expense (benefit) related to continuing operations	$ 108.6	$ 37.1	$ (740.8)