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Share-Based Compensation - Share-Based Compensation Expense and Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement [Abstract]
Share-based compensation expense	$ 13.5	$ 38.3	$ 34.9
Tax benefit	0.0	0.0	0.0
Share-based compensation expense, net of tax benefit	13.5	38.3	34.9
Cash received upon the exercise of stock options	0.0	0.0	0.0
Write-off tax benefits related to share-based compensation	$ 0.0	$ 0.0	$ 0.0

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Share Based Compensation Expense Net of Tax.

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Write-Off Tax Benefits Related To Share-Based Compensation

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Amount of cash inflow from exercise of option under share-based payment arrangement.

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