Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Tax Examination [Line Items]
Net deferred tax liability	$ 2.1	$ 2.4
Income tax receivable	20.1	27.3
Income tax refunds	14.4
Net operating loss carryforwards	689.1
Estimated amount of net operating loss carryforwards that will not be utilized	298.6
Foreign tax credit carryforwards, subject to expriration	16.9
Valuation allowance	454.1	448.4
Unrecognized tax benefits that would impact effective tax rate	24.8	25.8
Unrecognized Tax Benefits, Interest on Income Taxes Expense	1.4	2.2
Interest accrual reversal	2.6	5.6
Interest accrued net reduction	1.2	3.4
Total amount of interest accrued for uncertain tax positions	14.5	15.7
Amount by which unrecognized tax benefits may decrease over the next 12 months	21.2
State and Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Tax paid to settle audits of tax years 2001-08 for certain subsidiaries	1.2
Interest paid to settle audits of tax years 2001-08 for certain subsidiaries	$ 0.8