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Cash, Cash Equivalents and Restricted Cash (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Restricted cash included in other current assets	$ 30.5	$ 30.3
Accrued lease turnover costs	1.6	1.6
Restricted cash included in other long-term assets	6.3	6.3
ARO financial assurance [Member]
Restricted cash included in other current assets	16.4	16.3
Lease turnover financial assurance [Member]
Restricted cash included in other current assets	13.9	13.8
Restricted cash included in other long-term assets	13.9	0.0
Workers compensation financial assurance [Member]
Restricted cash included in other long-term assets	$ 6.0	$ 6.0

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Accrued lease turnover costs

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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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