Fair Value Measurement (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2011
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Broadcast rights payable	$ 10.4	$ 14.0
Long-term debt	380.0	195.0
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Broadcast rights payable	10.2	13.5
Long-term debt	$ 384.9	$ 205.1