Income Tax - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating Loss Carryforwards [Line Items]
Net discrete tax expense	$ 18.0	$ 135.0	$ 38.5	$ 121.7
Potential decrease in unrecognized tax benefits	250.0		250.0
Estimated cash outflow related to income tax examination	$ 100.0		$ 100.0
Minimum
Operating Loss Carryforwards [Line Items]
Estimated income tax expense				$ 135.0

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Estimated amount of loss resulting from an adverse tax position.

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The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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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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