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Segment Information Segment Information by Major Geographic Area (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues and Long-Lived Assets                      
Long-Lived Assets $ 796.5       $ 791.5       $ 796.5 $ 791.5  
Revenue 2,072.6 1,726.5 1,740.7 1,474.8 2,005.2 1,553.4 1,611.7 1,337.0 7,014.6 6,507.3 6,007.4
Domestic
                     
Revenues and Long-Lived Assets                      
Long-Lived Assets 477.2       480.6       477.2 480.6  
Revenue                 3,887.7 3,709.9 3,372.3
Total international
                     
Revenues and Long-Lived Assets                      
Long-Lived Assets 319.3       310.9       319.3 310.9  
Revenue                 3,126.9 2,797.4 2,635.1
United Kingdom
                     
Revenues and Long-Lived Assets                      
Long-Lived Assets 65.2       47.4       65.2 47.4  
Revenue                 539.4 469.6 458.5
Continental Europe
                     
Revenues and Long-Lived Assets                      
Long-Lived Assets 72.1       85.2       72.1 85.2  
Revenue                 908.9 863.2 922.2
Asia Pacific
                     
Revenues and Long-Lived Assets                      
Long-Lived Assets 78.4       82.1       78.4 82.1  
Revenue                 741.7 639.8 575.4
Latin America
                     
Revenues and Long-Lived Assets                      
Long-Lived Assets 69.1       57.8       69.1 57.8  
Revenue                 444.4 363.3 287.1
Other
                     
Revenues and Long-Lived Assets                      
Long-Lived Assets 34.5       38.4       34.5 38.4  
Revenue                 $ 492.5 $ 461.5 $ 391.9