Significant Financing Transactions (Schedule of Equity Units) (Details) (USD $) Share data in Millions, unless otherwise specified	0 Months Ended
	Jun. 07, 2013 Class A	Jun. 07, 2013 Class B	Sep. 30, 2013 Remarketable Subordinated Notes Class A	Jun. 07, 2013 Remarketable Subordinated Notes Class A	Sep. 30, 2013 Remarketable Subordinated Notes Class B	Jun. 07, 2013 Remarketable Subordinated Notes Class B
Capital Unit [Line Items]
Units Issued	11	11
Total Net Proceeds	$ 533,500,000	$ 533,500,000
Total Long-term Debt				550,000,000		550,000,000
RSN Annual Interest Rate			1.07%		1.18%
Stock Purchase Contract Annual Rate	5.055%	4.82%
Stock Purchase Contract Liability	$ 76,700,000	$ 79,300,000