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Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Carrying Reported Amount Fair Value Disclosure
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 355.1 $ 1,026.8
Derivative financial instruments, Assets 16.1 4.3
Derivative Financial Instruments, liabilities 8.0 21.6
Debt 1,538.1 1,947.3
Estimate Of Fair Value Fair Value Disclosure
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 355.1 1,026.8
Derivative financial instruments, Assets 16.1 4.3
Derivative Financial Instruments, liabilities 8.0 21.6
Debt 1,751.6 2,072.6
Fair Value Inputs Level 1
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 355.1 1,026.8
Derivative financial instruments, Assets 0 0
Derivative Financial Instruments, liabilities 0 0
Debt 1,713.5 2,027.8
Fair Value Inputs Level 2
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Derivative financial instruments, Assets 16.1 4.3
Derivative Financial Instruments, liabilities 8.0 21.6
Debt $ 38.1 $ 44.8