Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Liabilities:
Deferred cancellation of debt income	$ (92.4)	$ (93.0)
Investments in available for sale securities	(201.1)	(173.4)
Unconsolidated affiliates and investments	0	(12.2)
Accumulated depreciation and amortization	(36.9)	(34.8)
Prepaid expenses	(7.0)	(4.9)
Debenture original issue discount	0	(19.3)
Total deferred tax liabilities	(337.4)	(337.6)
Assets:
Deferred compensation and other employee benefits	30.4	46.3
Net operating loss	14.1	16.9
Book accruals	36.4	29.9
Unconsolidated affiliates and investments	1.5	0
Other	1.4	1.9
Total deferred tax assets	83.8	95.0
Valuation allowance	(10.2)	(14.6)
Net deferred tax liability	$ (263.8)	$ (257.2)