Taxes Net Operating Loss Carryforwards (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 451.1	$ 473.1
Amount of Net Operating Losses related to business acquisition	304.8	315.7
Net operating losses year of origination [Abstract]
Net operating loss carryforwards originating in 2003	21.7
Net operating loss carryfowards originating in 2004	152.4
Net operating loss carryfowards originating in 2005	74.1
Net operating loss carryfowards originating in 2006	53.3
Net operating loss carryfowards originating in 2007	1.3
Net operating loss carryfowards originating in 2008	2.4
Net operating loss carryfowards originating in 2009	23.8
Net operating loss carryfowards originating in 2010	12.0
Net operating loss carryfowards originating in 2011	110.1
Internal Revenue Service (IRS) [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Expected revised current deferred income tax asset for net operating losses	0
Internal Revenue Service (IRS) [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Expected revised current deferred income tax asset for net operating losses	10.0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	66.1	70.6
Amount of Net Operating Losses related to business acquisition	47.9	49.9
Operating Loss Carryforwards, Valuation Allowance	$ 23.3