v3.25.4
Interim Financial Data by Segment - Schedule of Financial Data Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Segment Reporting Information [Line Items]        
Revenues $ 1,713.9 $ 1,589.2 $ 3,303.3 $ 3,012.1
Depreciation and amortization 33.3 32.8 65.9 65.1
Amortization of acquired intangibles 51.7 49.5 102.4 97.7
Amortization of other assets 42.1 43.1 84.7 85.9
Other direct expenses 1,216.6 1,287.7 2,467.0 2,487.1
Other segment items 0.0 0.0 0.0 0.0
Earnings before income taxes 370.2 176.0 583.3 276.3
Corporate and Other        
Segment Reporting Information [Line Items]        
Revenues 0.0 0.0 0.0 0.0
Depreciation and amortization 9.1 8.3 17.6 16.7
Amortization of acquired intangibles 0.0 0.0 0.0 0.0
Amortization of other assets 5.7 4.3 11.2 8.7
Other direct expenses (27.9) 146.0 62.3 280.0
Other segment items (142.9) (110.9) (266.4) (214.0)
Earnings before income taxes 155.9 (47.7) 175.3 (91.4)
Investor Communication Solutions        
Segment Reporting Information [Line Items]        
Revenues 1,233.3 1,149.2 2,363.2 2,164.8
Investor Communication Solutions | Operating Segments        
Segment Reporting Information [Line Items]        
Revenues 1,233.3 1,149.2 2,363.2 2,164.8
Depreciation and amortization 11.6 11.2 23.4 22.2
Amortization of acquired intangibles 10.6 10.9 20.3 22.5
Amortization of other assets 9.8 9.5 20.1 20.0
Other direct expenses 960.4 870.4 1,842.1 1,686.7
Other segment items 104.2 73.2 194.0 142.8
Earnings before income taxes 136.8 174.1 263.2 270.6
Global Technology And Operations        
Segment Reporting Information [Line Items]        
Revenues 7.5   11.2  
Global Technology And Operations | Operating Segments        
Segment Reporting Information [Line Items]        
Revenues 480.6 440.0 940.1 847.2
Depreciation and amortization 12.6 13.3 24.9 26.1
Amortization of acquired intangibles 41.1 38.6 82.1 75.2
Amortization of other assets 26.6 29.3 53.3 57.2
Other direct expenses 284.1 271.3 562.6 520.4
Other segment items 38.7 37.7 72.4 71.2
Earnings before income taxes 77.6 49.7 144.9 97.1
Total Reportable Segments | Operating Segments        
Segment Reporting Information [Line Items]        
Revenues 1,713.9 1,589.2 3,303.3 3,012.1
Depreciation and amortization 24.2 24.5 48.3 48.4
Amortization of acquired intangibles 51.7 49.5 102.4 97.7
Amortization of other assets 36.4 38.8 73.5 77.2
Other direct expenses 1,244.5 1,141.7 2,404.7 2,207.1
Other segment items 142.9 110.9 266.4 214.0
Earnings before income taxes $ 214.3 $ 223.8 $ 408.1 $ 367.7