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Financial Instruments (Recycling Commodity Hedges) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Gain (loss) recognized in other comprehensive income	$ 26,700,000	$ (3,700,000)	$ (20,600,000)
Recycling commodity hedges
Derivative [Line Items]
Gain (loss) recognized in other comprehensive income	100,000	400,000	$ (500,000)
Fair Value, Measurements, Recurring \| Recycling commodity hedges
Derivative [Line Items]
Derivative liability		200,000
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 \| Recycling commodity hedges
Derivative [Line Items]
Derivative asset	0
Derivative liability	$ 0	$ 200,000