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Cash, Cash Equivalents and Restricted Cash (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Restricted cash included in other current assets	$ 18.0	$ 30.3
Accrued lease turnover costs		1.6
Restricted cash included in other long-term assets	5.7	6.3
ARO financial assurance [Member]
Restricted cash included in other current assets	16.9	16.6
Increase (decrease) in restricted cash	13.5
Lease turnover financial assurance [Member]
Restricted cash included in other current assets	0.0	13.5
Restricted cash included in other long-term assets		0.0
Workers compensation financial assurance [Member]
Restricted cash included in other current assets	0.6
Restricted cash included in other long-term assets	$ 5.4	$ 6.0

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Accrued lease turnover costs

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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