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Fair Value Information (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Assets
Cash, cash equivalents and restricted cash	$ 531.1	$ 219.7	$ 154.8	$ 113.7
Liabilities
Debt	250.0	589.0
Level 1 | Carrying Amount
Assets
Cash, cash equivalents and restricted cash	531.1	219.7
Liabilities
Debt	247.4	247.1
Level 1 | Estimated Fair Value
Assets
Cash, cash equivalents and restricted cash	531.1	219.7
Liabilities
Debt	256.6	259.7
Level 2 | Carrying Amount
Liabilities
Debt	0.0	333.8
Level 2 | Estimated Fair Value
Liabilities
Debt	$ 0.0	$ 341.1

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. 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, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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