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Significant Accounting Policies (Details 6)
In Millions, unless otherwise specified
Jun. 30, 2012
USD ($)
Dec. 31, 2011
USD ($)
Jun. 30, 2012
Interest rate swap
USD ($)
instrument
Dec. 31, 2011
Interest rate swap
USD ($)
Jun. 30, 2012
Interest rate cap
USD ($)
instrument
Jun. 30, 2012
USD-Yen currency forward contract
USD ($)
Jun. 30, 2012
USD-Yen currency forward contract
JPY (¥)
Dec. 31, 2011
USD-Euro currency forward contract
USD ($)
Dec. 31, 2011
USD-Euro currency forward contract
EUR (€)
Derivative financial instruments                  
Number of Instruments     3   6        
Notional Amount     $ 484.7   $ 444.4        
Interest rate derivative liability, fair value     6.2 10.0          
Notional amount, foreign currency derivatives (in Japanese Yen / Euro)             4,900.0   141.3
Fair value of foreign exchange forward contracts, net           0.3      
Liability balance, foreign exchange forward contracts           0.4      
Asset value of forwards included in deferred costs and other assets           0.1   14.9  
Gross accumulated other comprehensive income or loss related to derivative activities $ 102.5 $ 115.8