XML 46 R50.htm IDEA: XBRL DOCUMENT v2.4.0.6
Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Carrying Reported Amount Fair Value Disclosure Member
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash And Cash Equivalents Fair Value Disclosure $ 304.6 $ 380.6
Derivative Assets 6.2 20.7
Derivative Financial Instruments Liabilities Fair Value Disclosure 11.8 17.1
Debt Instrument Fair Value 1,480.1 1,509.3
Estimate Of Fair Value Fair Value Disclosure Member
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash And Cash Equivalents Fair Value Disclosure 304.6 380.6
Derivative Assets 6.2 20.7
Derivative Financial Instruments Liabilities Fair Value Disclosure 11.8 17.1
Debt Instrument Fair Value 1,703.2 1,791.3
Fair Value Inputs Level 1 [Member]
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash And Cash Equivalents Fair Value Disclosure 304.6 380.6
Derivative Assets 0 0
Derivative Financial Instruments Liabilities Fair Value Disclosure 0 0
Debt Instrument Fair Value 1,625.6 1,684.5
Fair Value Inputs Level 2 [Member]
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash And Cash Equivalents Fair Value Disclosure 0 0
Derivative Assets 6.2 20.7
Derivative Financial Instruments Liabilities Fair Value Disclosure 11.8 17.1
Debt Instrument Fair Value $ 77.6 $ 106.8