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Basis of Preparation - Impact on Financial Statements (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Liabilities
Accrued income taxes	$ 46.0	$ 46.5
Current convertible notes	255.2	220.9
Long-term deferred tax liabilities	49.9	60.2
Equity
Additional paid-in capital	750.0	780.8
Retained earnings	$ 844.7	808.4
Cumulative Effect, Period of Adoption, Adjustment
Liabilities
Accrued income taxes		(0.2)
Current convertible notes		34.0
Long-term deferred tax liabilities		(7.6)
Equity
Additional paid-in capital		(36.9)
Retained earnings		10.7
Cumulative Effect, Period of Adoption, Adjusted Balance
Liabilities
Accrued income taxes		46.3
Current convertible notes		254.9
Long-term deferred tax liabilities		52.6
Equity
Additional paid-in capital		743.9
Retained earnings		$ 819.1

X

- Definition

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

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