Long-Term Debt Long Term Debt (Schedule of Equity Units) (Details) - USD ($) shares in Millions, $ in Millions				12 Months Ended
		Jul. 01, 2014	Jun. 07, 2013	Dec. 31, 2015	Dec. 31, 2014
Capital Unit [Line Items]
Stock Purchase Contract Liability	[1]			$ 115.0	$ 216.0
Total payments				$ 101.0	$ 66.0
Capital Unit, Class A
Capital Unit [Line Items]
Units Issued		20	11
Total Net Proceeds		$ 982.0	$ 533.5
Stock Purchase Contract Annual Rate		4.875%	5.055%
Stock Purchase Contract Liability	[1]	$ 142.8	$ 76.7
Capital Unit, Class A | Remarketable Subordinated Notes
Capital Unit [Line Items]
Total Long-term Debt		$ 1,000.0	$ 550.0
RSN Annual Interest Rate		1.50%	1.07%
Capital Unit, Class B
Capital Unit [Line Items]
Units Issued			11
Total Net Proceeds			$ 553.5
Stock Purchase Contract Annual Rate			4.82%
Stock Purchase Contract Liability	[1]		$ 79.3
Capital Unit, Class B | Remarketable Subordinated Notes
Capital Unit [Line Items]
Total Long-term Debt			$ 550.0
RSN Annual Interest Rate			1.18%

[1] Payments of $101 million and $66 million were made in 2015 and 2014, respectively. The stock purchase contract liability was $115 million and $216 million at December 31, 2015 and 2014, respectively.