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Supplementary Data Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Accrued Liabilities [Abstract]      
Salaries, benefits and related expenses   $ 441.9 $ 504.6
Interest   40.9 43.6
Acquisition obligations   32.8 47.9
Restructuring charges   22.4 69.5
Office and related expenses   18.2 25.5
Income Taxes payable   26.2 50.6
Other   97.4 $ 90.7
Total Accrued Liabilities $ 832.4 $ 679.8