Acquisitions (Purchase Price Allocation Schedule) (Details) (USD $) In Millions, unless otherwise specified	Nov. 08, 2012 Puerto Rico Transaction [Member]	Dec. 15, 2011 KBW [Member]	Sep. 16, 2011 Aster [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	$ 4.4	$ 233.8	$ 22.0
Other current assets	19.2	64.9	19.3
Property and equipment, net	150.2	2,197.1	125.2
Intangible assets subject to amortization	90.5	865.6	225.0
Intangible assets not subject to amortization - cable television franchise rights	285.0
Goodwill	226.1	1,839.8	476.8
Other assets, net	1.2	58.8	0.4
Current portion of long-term debt and capital lease obligations	(3.5)	(7.3)	0
Other current liabilities	(54.1)	(221.7)	(24.5)
Long -term debt and capital lease obligations	(496.9)	(3,286.6)	0
Other long-term liabilities		(362.5)	(59.5)
Deferred tax liabilities	(125.6)
Total purchase price	$ 96.5	$ 1,381.9	$ 784.7

Business Acquisition Purchase Price Allocation Long Term Debt and Capital Lease Obligations, Current

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- Definition

Business Acquisition Purchase Price Allocation Long Term Debt and Capital Lease Obligations, Non-current

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No definition available.

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- Definition

Business Acquisition, Purchase Price Allocation, Not Amortizable Intangible Assets

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No definition available.

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The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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- Definition

The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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- Definition

The amount of cash and cash equivalents acquired in a business combination.

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- Definition

The amount of acquisition cost of a business combination allocated to prepaid expenses and other current assets. Does not include amounts allocated to cash and cash equivalents, marketable securities, receivables, inventory, and assets not to be used.

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The amount of acquisition cost of a business combination allocated to current liabilities of the acquired entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph e

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 98-1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Amount of acquisition cost of a business combination allocated to noncurrent deferred tax assets net of valuation allowance and noncurrent deferred tax liabilities.

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- Definition

Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 53

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The amount of acquisition cost of a business combination allocated to noncurrent liabilities of the acquired entity.

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Amount of acquisition cost of a business combination allocated to other noncurrent assets not separately disclosed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 98-1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 37

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

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