Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION, Share-based Arrangements with Employees and Nonemployees (Details)

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STOCK-BASED COMPENSATION, Share-based Arrangements with Employees and Nonemployees (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Azoff Trust Note [Member]
Sep. 30, 2010
Azoff Trust Note [Member]
Sep. 30, 2011
Azoff Trust Note [Member]
Sep. 30, 2010
Azoff Trust Note [Member]
Sep. 30, 2011
Restricted Stock [Member]
Sep. 30, 2011
Market-based or performance-based awards [Member]
Sep. 30, 2011
Stock Options [Member]
Sep. 30, 2011
Ticketmaster [Member]
Sep. 30, 2010
Ticketmaster [Member]
Sep. 30, 2011
Ticketmaster [Member]
Selling, general, and administrative expenses [Member]
Sep. 30, 2010
Ticketmaster [Member]
Selling, general, and administrative expenses [Member]
Sep. 30, 2011
Ticketmaster [Member]
Corporate expenses [Member]
Sep. 30, 2010
Ticketmaster [Member]
Corporate expenses [Member]
Sep. 30, 2010
Ticketmaster [Member]
Employee Severance [Member]
Sep. 30, 2010
Ticketmaster [Member]
Employees with change in control provisions in employment contracts [Member]
Mar. 31, 2011
Front Line [Member]
Mar. 31, 2011
Front Line [Member]
Selling, general, and administrative expenses [Member]
Share-based arrangements with employees and nonemployees [Abstract]                                    
Restricted stock granted during period (in shares)           0.7 0.3                      
Fair market value of shares awarded           $ 6.7 $ 2.7 $ 13.0                    
Stock options granted during period (in shares)               2.5                    
Vesting period           4Y 4Y 4Y                    
Stock-based compensation                 0 14.7 0 6.4 0 8.3     24.4 24.4
Shares accelerated and modified vesting (in shares)                             1.4 1.1    
Total unrecognized compensation cost 69.4                                  
Interest rate on note issued (in hundredths)   3.00%   3.00%                            
Payable in monthly installments       0.8                            
Corporate expenses related to Azoff Trust note   $ 1.6 $ 1.6 $ 4.8 $ 4.3