Income Taxes (Details 2) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Liabilities:
Deferred cancellation of debt income	$ (36.4)	$ (55.4)
Investments in available for sale securities	(62.2)	(54.8)
Unconsolidated affiliates and investments	(27.9)	(9.7)
Accumulated depreciation and amortization	(65.3)	(41.8)
Prepaid expenses	5.5	8.1
Total deferred tax liabilities	197.3	169.8
Assets:
Deferred compensation and other employee benefits	23.2	36.4
Net operating loss	8.5	12.8
Accrued liabilities	26.9	30.8
Other	1.4	3.1
Total deferred tax assets	60.0	83.1
Valuation allowance	(6.0)	(10.5)
Net deferred tax liability	$ (143.3)	$ (97.2)