Landfill and Environmental Costs (Environmental Remediation Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Activity in environmental remediation liabilities
Environmental remediation liabilities, beginning of year	$ 462.8	$ 500.2	$ 540.2
Net additions charged to expense	0.5	5.1	(12.5)
Payments	(57.1)	(63.5)	(49.1)
Accrual For Environmental Loss Contingencies Accretion Expense	17.1	18.6	19.0
Acquisitions, net of divestitures and other adjustments	31.6	2.4	2.6
Environmental remediation liabilities, end of year	454.9	462.8	500.2
Less: current portion	(56.1)	(57.0)	(56.8)
Long-term portion	$ 398.8	$ 405.8	$ 443.4