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Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Carrying Reported Amount Fair Value Disclosure
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 837.7 $ 1,026.8
Derivative financial instruments, Assets 8.9 4.3
Derivative Financial Instruments, liabilities 14.5 21.6
Debt 1,946.8 1,947.3
Estimate Of Fair Value Fair Value Disclosure
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 837.7 1,026.8
Derivative financial instruments, Assets 8.9 4.3
Derivative Financial Instruments, liabilities 14.5 21.6
Debt 2,102.4 2,072.6
Fair Value Inputs Level 1
   
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 837.7 1,026.8
Derivative financial instruments, Assets 0 0
Derivative Financial Instruments, liabilities 0 0
Debt 2,058.1 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 8.9 4.3
Derivative Financial Instruments, liabilities 14.5 21.6
Debt $ 44.3 $ 44.8