v3.26.1
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 29, 2026
Jun. 15, 2026
Jun. 14, 2026
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Accounting Policies [Line Items]                
Property straight-line revenue       $ (18.9) $ 28.2 $ 0.0 $ 45.3  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | ATC Philippines                
Accounting Policies [Line Items]                
Total consideration received upon disposal   $ 75.6            
Gain (loss) on sale of subsidiary   $ 33.2            
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Kirtonkhola Tower Bangladesh Limited                
Accounting Policies [Line Items]                
Total consideration received upon disposal $ 6.9              
Gain (loss) on sale of subsidiary $ (12.8)              
U.S. | Data Centers | Common Stock                
Accounting Policies [Line Items]                
Percentage of ownership after transaction (as a percent)           71.00%    
APAC | Product Benchmark | Property | Geographic Concentration Risk                
Accounting Policies [Line Items]                
Concentration risk percentage (less than for year ended December 31, 2025)               1.00%
APAC | Segment Gross Margin | Geographic Concentration Risk                
Accounting Policies [Line Items]                
Concentration risk percentage (less than for year ended December 31, 2025)               1.00%
APAC | Segment Operating Profit | Geographic Concentration Risk                
Accounting Policies [Line Items]                
Concentration risk percentage (less than for year ended December 31, 2025)               1.00%
APAC | Communication Sites | Geographic Concentration Risk                
Accounting Policies [Line Items]                
Concentration risk percentage (less than for year ended December 31, 2025)     1.00%          
ATC Europe                
Accounting Policies [Line Items]                
Controlling ownership interest percentage (as a percent)       52.00%   52.00%    
Stonepeak | U.S. | Data Centers | Common Stock                
Accounting Policies [Line Items]                
Noncontrolling owner ownership percentage (as a percent)       29.00%   29.00%    
Stonepeak | U.S. | Data Centers | Preferred stock                
Accounting Policies [Line Items]                
Noncontrolling owner ownership percentage (as a percent)       100.00%   100.00%    
Germany                
Accounting Policies [Line Items]                
Noncontrolling owner ownership percentage (as a percent)       13.00%   13.00%    
Germany | ATC Europe                
Accounting Policies [Line Items]                
Controlling ownership interest percentage (as a percent)       87.00%   87.00%    
Spain                
Accounting Policies [Line Items]                
Noncontrolling owner ownership percentage (as a percent)       17.00%   17.00%    
Spain | ATC Europe                
Accounting Policies [Line Items]                
Controlling ownership interest percentage (as a percent)       83.00%   83.00%