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Accumulated Other Comprehensive Loss, Net of Tax - Reclassification from Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Other expense, net $ (5.7) $ (2.7) $ (44.0) $ (13.4)
Other expense, net, Interest expense (30.3) (23.4) (108.4) (69.5)
Provision for income taxes (58.7) (85.3) (104.1) (208.2)
NET INCOME AVAILABLE TO IPG COMMON STOCKHOLDERS 124.2 20.1 201.3 345.0
Reclassification Out of Accumulated Other Comprehensive Income        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Provision for income taxes 2.6 0.2 3.2 0.7
NET INCOME AVAILABLE TO IPG COMMON STOCKHOLDERS 7.3 1.8 29.5 3.1
Derivative Instruments | Reclassification Out of Accumulated Other Comprehensive Income        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Other expense, net 0.0 1.2 20.3 1.2
Other expense, net, Interest expense (0.9) (1.0) (2.9) (2.8)
Defined Benefit Pension and Other Postretirement Plans | Reclassification Out of Accumulated Other Comprehensive Income        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Other expense, net $ 10.8 $ 1.8 $ 15.3 $ 5.4