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Debt and Other Financing Arrangements - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 11 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Jan. 23, 2013
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jun. 18, 2013
Metropolis Dr., Austin, TX (Austin 2) [Member]
Dec. 31, 2011
Westway Park Blvd., Houston, TX (Houston West 1) [Member]
Dec. 31, 2013
6.375% Senior Notes Due 2022 [Member]
Dec. 31, 2012
6.375% Senior Notes Due 2022 [Member]
Nov. 20, 2012
6.375% Senior Notes Due 2022 [Member]
Dec. 31, 2013
6.375% Senior Notes Due 2022 [Member]
Cyrus One Lp And Cyrus One Finance Corp [Member]
Nov. 20, 2013
Cincinnati Bell Inc. [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
London Interbank Offered Rate (LIBOR) [Member]
Dec. 31, 2013
London Interbank Offered Rate (LIBOR) [Member]
Minimum [Member]
Dec. 31, 2013
London Interbank Offered Rate (LIBOR) [Member]
Maximum [Member]
Dec. 31, 2013
Base Rate [Member]
Dec. 31, 2013
Base Rate [Member]
Minimum [Member]
Dec. 31, 2013
Base Rate [Member]
Maximum [Member]
Dec. 31, 2013
Base Rate, LIBOR [Member]
Dec. 31, 2013
Base Rate, Federal Funds [Member]
Sep. 30, 2013
Revolving Credit Facility [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
Nov. 20, 2012
Revolving Credit Facility [Member]
Nov. 20, 2012
Letter of Credit [Member]
Nov. 20, 2012
Swing Line Loans [Member]
Debt Instrument [Line Items]                                                    
Credit agreement amount                                               $ 225 $ 50 $ 30
Basis spread on variable rate                           3.25% 3.25% 3.75% 2.25% 2.25% 2.75% 1.00% 0.50%          
Shareholders cash dividends in an amount not to exceed                         95.00%                          
Outstanding borrowings on revolving credit agreement                                           0 0      
Commitment fee percent     0.50%                                              
Commitment fee amount     1.1                                              
Interest expense on capital lease obligations 0.3 6.3   7.4 5.4                                          
Extinguishment of debt           12.2 1.4         80.0                            
Stated interest rate               6.375% 6.375% 6.375%                                
Long-term debt                   525.0                                
Total unencumbered assets     150.00%                                              
Percentage of redemption price                     100.00%                              
Percentage of senior notes declining redemption 1                     103.188%                              
Percentage of senior notes declining redemption 2                     102.125%                              
Percentage of senior notes declining redemption 3                     101.063%                              
Percentage of senior notes declining redemption 4                     100.00%                              
Percentage of Redemption of the aggregate principal                     35.00%                              
Percentage of equity offering on principal amount                     106.375%                              
Percentage of Redemption of the least aggregate principal                     65.00%                              
Number of redemption occurs                     90 days                              
Deferred financing costs   14.1 14.1 16.9                                            
Amortization of deferred financing costs $ 0.1 $ 4.0   $ 0.3 $ 0                                          
Shareholders cash dividends in amount not to exceed     95.00%