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Stock-based Compensation - PRSU And RSU Activity And Related Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Performance-based Restricted Stock Units
Shares
Beginning balance (in shares)	3.5	3.5	8.0
Granted (in shares)	0.6	3.5	0.3
Vested (in shares)		(3.4)	0.0
Forfeited/Terminated (in shares)		0.0	(4.8)
Ending balance (in shares)		3.6	3.5
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 15.02	$ 15.02	$ 15.27
Granted (in dollars per share)	$ 21.39	21.39	21.35
Vested (in dollars per share)		15.03	0
Forfeited/Terminated (in dollars per share)		0	17.74
Ending balance (in dollars per share)		$ 21.18	$ 15.02
Restricted Stock Units and Deferred Stock Units
Shares
Beginning balance (in shares)	5.1	5.1	3.3
Granted (in shares)		0.8	2.7
Vested (in shares)		(1.6)	(0.9)
Forfeited/Terminated (in shares)		(0.1)	0.0
Ending balance (in shares)		4.2	5.1
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 13.24	$ 13.24	$ 15.96
Granted (in dollars per share)		20.81	10.77
Vested (in dollars per share)		13.43	15.64
Forfeited/Terminated (in dollars per share)		13.99	0
Ending balance (in dollars per share)		$ 14.57	$ 13.24
Intrinsic value		$ 113.6	$ 110.3

X

- Definition

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to equity instruments other than stock options outstanding under the plan as of the balance sheet date.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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