Other Liabilities (Other Accrued and Other Long-Term Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Accrued Liabilities
Accrued payroll and benefits	$ 295.0	$ 221.1
Insurance reserves, current portion	193.5	167.5	$ 162.0
Accrued dividends	145.9	135.5
Accrued fees and taxes	143.7	132.3
Operating right-of-use lease liabilities, current portion	38.2	33.5
Ceded insurance reserves, current portion	31.0	34.1
Accrued professional fees and legal settlement reserves	8.4	7.2
Other	73.8	89.0
Total	929.5	820.2
Other Long-Term Liabilities
Operating right-of-use lease liabilities	239.0	206.6
Deferred compensation plan liability	119.4	126.6
Ceded Premiums Payable	79.5	84.8
Contingent purchase price and acquisition holdbacks	64.4	67.3
Other derivative liabilities	50.7	103.0
Withdrawal liability - multiemployer pension funds	24.5	22.3
Legal settlement reserves	3.1	20.2
Pension and other post-retirement liabilities	1.2	5.5
Other	60.6	45.5
Total	$ 642.4	$ 681.8