Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
State net operating losses	$ 252.8	$ 180.3
Foreign net operating losses	24.3	37.8
Federal net operating loss	1,280.9	850.2
Compensation programs	141.5	120.6
Allowance for doubtful accounts	76.4	87.6
Self-insurance reserves	16.4	15.7
Accrued expenses	44.4	44.6
Federal tax credits	34.7	33.7
Federal indirect tax benefits of uncertain state tax positions	27.2	52.8
Outside basis difference in foreign subsidiaries	0	61.5
Investment in CGP LLC	23.4	0
Investments in non-consolidated affiliates	38.7	0
Capital loss carryover	136.4	0
Deferred revenue	41.2	2.0
Other	10.3	18.6
Subtotal	2,148.6	1,505.4
Less: valuation allowance	739.5	330.0
Total deferred tax assets	1,409.1	1,175.4
Depreciation and other property-related items	1,188.9	2,241.7
Deferred cancellation of debt income and other debt-related items	1,833.6	1,913.4
Management and other contracts	0	3.9
Intangibles	1,118.1	1,255.7
Prepaid expenses	25.0	28.3
Investments in non-consolidated affiliates	0	3.5
Total deferred tax liabilities	4,165.6	5,446.5
Net deferred tax liability	$ 2,756.5	$ 4,271.1