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Investment in CyrusOne (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Jul. 01, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]                
Equity Method Investment Sold, Partnership Units 6.0 14.3 16.0          
Sale of Partnership Units, Price Per Unit $ 28.41 $ 29.88 $ 22.26          
Proceeds from Sale of Equity Method Investments $ 170.3 $ 426.0 $ 355.9 $ 426.0 $ 355.9      
Equity Method Investment, Realized Gain (Loss) on Disposal $ 117.7 $ 295.2 192.8 $ 295.2 192.8      
Total ownership interests in CyrusOne, Percentage   18.00%   18.00%   11.00%    
Investment owned in CyrusOne Inc., Balance, Shares   1.9   1.9   1.9    
Investment owned in CyrusOne LP, Balance, Partnership Units   12.3   12.3   6.3    
(Income) loss from CyrusOne equity method investment   $ 1.3 2.4 $ 4.4 1.9      
Equity Method Investments, Fair Value Disclosure   419.1   419.1     $ 785.0  
Dividends received from CyrusOne   9.0 9.3 15.0 16.4      
Assets Deconsolidated [Abstract]                
Cash   14.8 347.2 14.8 347.2   57.9 $ 4.6
Receivables   150.0   150.0     160.8  
Other current assets   1.3   1.3     1.8  
Property, plant and equipment   894.5   894.5     815.4  
Other noncurrent assets   28.6   28.6     33.9  
Total assets   1,509.6   1,509.6     1,820.7  
Liabilities Deconsolidated [Abstract]                
Current portion of long-term debt   12.5   12.5     11.6  
Accounts payable   123.7   123.7     131.6  
Unearned revenue and customer deposits   27.7   27.7     30.4  
Other current liabilities   23.9   23.9     25.8  
Long-term debt   1,379.0   1,379.0     1,689.4  
Other noncurrent liabilities   39.1   39.1     26.2  
Total liabilities   1,913.1   1,913.1     $ 2,469.2  
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]                
Operating income (loss)   $ 29.7 47.3 $ 66.8 97.7      
CyrusOne [Member]                
Schedule of Equity Method Investments [Line Items]                
Dividends Payable, Amount Per Share   $ 0.315   $ 0.315        
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]                
Revenue   $ 89.1 81.7 $ 174.8 159.2      
Operating income (loss)   2.6 7.4 4.2 19.2      
Net income (loss)   (6.5) (3.6) (13.7) (2.9)      
CyrusOne [Member]                
Schedule of Equity Method Investments [Line Items]                
Revenue from Related Parties   $ 0.4 $ 0.4 $ 0.7 $ 0.9