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Debt (Schedule of Convertible Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Debt Instrument [Line Items]
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 220.0
Convertible Debt [Member] | 3.00% Exchangeable senior notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Face Amount	849.5	$ 849.5	$ 849.5
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	0.0	(150.5)
Convertible Debt	849.5	699.0
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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- Definition

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

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- Definition

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

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

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