Income Taxes (Operating Loss and Tax Credit Carryforwards) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
U.S. Federal net operating loss carryforwards	$ 505.9	$ 707.1
United States [Member]
U.S. Federal net operating loss carryforwards	696.3
U.S. credit carryforwards	45.2
State and Local Jurisdiction [Member]
U.S. credit carryforwards	36.6
U.S. State net operating loss carryforwards	2,966.8
Non-U.S. [Member]
Non-U.S. net operating loss carryforwards	867.8
Non-U.S. credit carryforwards	$ 2.2