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Financial Instruments and Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment in CyrusOne $ 500.8 $ 0
Investment in CyrusOne, fair value 1,015.9 0
Long-term debt, including current portion, carrying value 2,134.0 2,689.4
Other financing arrangements, carrying value 0 60.8
Other financing arrangements, fair value 0 69.5
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, including current portion, fair value $ 2,196.1 $ 2,834.6