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Financial Instruments (Details 1) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Notes payable and long-term debt:    
Common stockholders' equity $ 1,054.0 $ 924.3
Carrying Amount [Member]
   
Financial instruments not carried at fair value but which require fair value disclosure    
Cash, cash equivalents and restricted cash 100.8 89.8
Notes payable and long-term debt:    
Term Loan 394.0  
Common stockholders' equity 1,054.0 924.3
Carrying Amount [Member] | Revolving European Credit Facility [Member]
   
Notes payable and long-term debt:    
European credit facility 99.5  
Carrying Amount [Member] | 6.5% Senior Secured Notes [Member]
   
Notes payable and long-term debt:    
Fixed rate with market quotes - 6.5% Senior Secured Notes    360.6
Fair Value [Member]
   
Financial instruments not carried at fair value but which require fair value disclosure    
Cash, cash equivalents and restricted cash 100.8 89.8
Notes payable and long-term debt:    
Term Loan 394.0  
Common stockholders' equity 1,830.2 2,090.9
Fair Value [Member] | Revolving European Credit Facility [Member]
   
Notes payable and long-term debt:    
European credit facility 99.5  
Fair Value [Member] | 6.5% Senior Secured Notes [Member]
   
Notes payable and long-term debt:    
Fixed rate with market quotes - 6.5% Senior Secured Notes    $ 362.6