Financial Instruments (Fair Value Measurements) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 9,678,300,000
Contingent purchase price and acquisition holdbacks	64,400,000	$ 67,300,000
Changes to estimated fair value	0
Waste Management Contract, Sonoma County
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent purchase price and acquisition holdbacks	62,300,000
Waste Management Contract, Sonoma County | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Undiscounted future contingent payments, range of outcomes, value, low	77,000,000
Waste Management Contract, Sonoma County | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Undiscounted future contingent payments, range of outcomes, value, low	95,000,000
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	9,600,000,000	8,900,000,000
Contingent purchase price and acquisition holdbacks	68,800,000	70,600,000
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 10,300,000,000	$ 10,000,000,000