Income Taxes (Operating Loss Carryforwards) (Details 5) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	$ 666.7
U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	8.1
2013 [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	5.7
2013 [Member] | U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	0.7
2014 [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	6.1
2014 [Member] | U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	0.7
2015 [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	5.1
2015 [Member] | U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	0.7
2016 [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	5.4
2016 [Member] | U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	0.7
2017 [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	1.5
2017 [Member] | U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	0.7
2018 and after [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to expire	642.9
2018 and after [Member] | U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Income tax loss carryforwards to be fully utilized	$ 4.6