Income Taxes (Capital loss and research credit carryforwards) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Operating Loss Carryforwards [Line Items]
Federal and state net operating loss carry-forwards	$ 737.5
Research credit carryforwards
Operating Loss Carryforwards [Line Items]
Federal and state net operating loss carry-forwards	15.6
Federal research and experimentation tax credit carry-forwards expire prior to utilization	15.6
Federal capital loss carryforwards
Operating Loss Carryforwards [Line Items]
Federal and state net operating loss carry-forwards	15.5
Federal research and experimentation tax credit carry-forwards expire prior to utilization	$ 15.5