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Acquisitions (Narrative) (Details)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Jun. 30, 2013
USD ($)
Dec. 31, 2013
USD ($)
item
Dec. 31, 2012
USD ($)
item
Dec. 31, 2011
USD ($)
item
Oct. 29, 2013
Foreign Exchange Forward [Member]
USD ($)
Nov. 26, 2013
Oi. S. A. Acquisition [Member]
USD ($)
item
Nov. 21, 2013
Oi. S. A. Acquisition [Member]
Foreign Exchange Forward [Member]
USD ($)
Oct. 30, 2013
Oi. S. A. Acquisition [Member]
Foreign Exchange Forward [Member]
USD ($)
Oct. 29, 2013
Oi. S. A. Acquisition [Member]
Foreign Exchange Forward [Member]
BRL
Jul. 26, 2013
Oi. S. A. Acquisition [Member]
Foreign Exchange Forward [Member]
USD ($)
Jul. 26, 2013
Oi. S. A. Acquisition [Member]
Foreign Exchange Forward [Member]
BRL
Dec. 31, 2013
Other Acquisitions [Member]
item
Dec. 31, 2013
Brazilian Acquisiton [Member]
item
Jan. 10, 2014
Brazilian Acquisiton [Member]
Foreign Exchange Forward [Member]
BRL
contract
Feb. 11, 2014
Brazilian Acquisiton [Member]
Foreign Exchange Forward [Member]
USD ($)
Feb. 11, 2014
Brazilian Acquisiton [Member]
Foreign Exchange Forward [Member]
BRL
Dec. 31, 2013
Subsequent Event [Member]
USD ($)
item
Business Acquisition [Line Items]                                  
Number of towers, aquired right to use           2,113                      
Aggregate purchase price           $ 317.0                      
Cash paid for acquisition           299.2                     230.1
Acquisition liabilities to be paidover next year           17.8                      
Business acquistions period after closing date to determine additional adjustments   1 year       1 year                      
Number of towers acquired   2,502 6,630 1,085               389 800       154
Purchase price allocation adjustment to reclassify from Property and Equipment to Intangible Assets 54.1                                
Potential obligation recorded in accrued expenses   30.1 9.8                            
Increase (decrease) in estimated contingent consideration fair value   (1.5) 0.8 (0.7)                          
Foreign currency forward contracts, notional amount         314.0       687.5 305.0 697.1     750.0 318.9 775.0  
Gain (loss) on derivative             $ (12.8) $ 14.1                  
Number of contracts entered into                           2