Financial Instruments and Fair Value Measurements (Schedule of Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Assets:
Other Assets, Fair Value Disclosure	$ 17.2	$ 36.5
Assets, Fair Value Disclosure	50.6	75.2
Level 1 | Indemnification Agreement
Liabilities:
Restricted Cash and Cash Equivalents	104.0	60.2
Recurring
Assets:
Rabbi Trust Investments, Fair Value Disclosure	33.4	38.7
Liabilities:
Deferred Compensation Liability, Fair Value	24.1	36.9
Contingent consideration and acquired contingent liabilities	6.0	27.3
Total liabilities at fair value	30.1	64.2
Recurring | Level 1
Assets:
Rabbi Trust Investments, Fair Value Disclosure	21.7	24.9
Other Assets, Fair Value Disclosure	17.2	36.5
Assets, Fair Value Disclosure	38.9	61.4
Liabilities:
Deferred Compensation Liability, Fair Value	0.0	0.0
Contingent consideration and acquired contingent liabilities	0.0	0.0
Total liabilities at fair value	0.0	0.0
Recurring | Level 2
Assets:
Rabbi Trust Investments, Fair Value Disclosure	11.7	13.8
Other Assets, Fair Value Disclosure	0.0	0.0
Assets, Fair Value Disclosure	11.7	13.8
Liabilities:
Deferred Compensation Liability, Fair Value	24.1	36.9
Contingent consideration and acquired contingent liabilities	0.0	0.0
Total liabilities at fair value	24.1	36.9
Recurring | Level 3
Assets:
Rabbi Trust Investments, Fair Value Disclosure	0.0	0.0
Other Assets, Fair Value Disclosure	0.0	0.0
Assets, Fair Value Disclosure	0.0	0.0
Liabilities:
Deferred Compensation Liability, Fair Value	0.0	0.0
Contingent consideration and acquired contingent liabilities	6.0	27.3
Total liabilities at fair value	$ 6.0	$ 27.3