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Supplementary Data Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Accrued Liabilities [Abstract]
Salaries, benefits and related expenses		$ 569.2	$ 504.6
Interest		44.0	43.6
Office and related expenses		20.4	25.5
Acquisition obligations		15.7	47.9
Restructuring charges		11.5	69.5
Income Taxes payable		4.1	50.6
Other		95.5	$ 90.7
Total Accrued Liabilities	$ 832.4	$ 760.4

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Acquisition related costs such as deferred payments and other obligations

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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