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Significant Accounting Policies (Details 3) (Recurring, USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Level 1
   
Fair Value Measurement:    
Marketable securities with Level 1 fair value inputs $ 454.4 $ 417.0
Level 2
   
Fair Value Measurement:    
Interest rate swap agreements and foreign currency forward contracts, gross liability balance 6.6 12.2
Interest rate swap agreements and foreign currency forward contracts, gross asset balance $ 0.1 $ 14.9