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Basis of Preparation - Impact on Financial Statements (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Liabilities
Accrued income taxes	$ 12.7	$ 46.5
Current convertible notes	255.7	220.9
Long-term deferred tax liabilities	59.9	60.2
Equity
Additional paid-in capital	755.9	780.8
Retained earnings	$ 866.1	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

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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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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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