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Debt (Schedule of Convertible Debt) (Details) - Convertible Debt [Member] - 3.00% Exchangeable senior notes due 2024(2) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 849.5	$ 849.5
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(182.7)	(213.8)
Convertible Debt	666.8	635.7
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 220.0	$ 220.0

X

- Definition

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

+ References

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-Publisher FASB
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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

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