Share-Based Awards - Summary Of Restricted Share and RSUs Transactions (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($) $ / shares shares
Restricted Stock, Restricted Stock Units (RSUs) And Performance Restricted Stock Units (PRSUs) Settled In Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, beginning of period (in shares) \| shares	1,894
Granted (in shares) \| shares	1,149
Vested (in shares) \| shares	(717)
Forfeited (in shares) \| shares	(315)
Nonvested, end of period (in shares) \| shares	2,011
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other Than Options Outstanding, Weighted Average Exercise Price [Roll Forward]
Grant Date Fair Value Per Share, Nonvested, beginning of period (in dollars per share) \| $ / shares	$ 48
Grant Date Fair Value Per Share, Granted (in dollars per share) \| $ / shares	37
Grant Date Fair Value Per Share, Vested (in dollars per share) \| $ / shares	46
Grant Date Fair Value Per Share, Forfeited (in dollars per share) \| $ / shares	41
Grant Date Fair Value Per Share, Nonvested, end of period (in dollars per share) \| $ / shares	$ 43
Unrecognized compensation \| $	$ 31.1
Weighted-average period of recognition (years)	1 year 8 months 12 days
Restricted Stock Units (RSUIs) And Performance Restricted Stock Units (PRSUIs) Settled in Cash
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, beginning of period (in shares) \| shares	105
Granted (in shares) \| shares	94
Vested (in shares) \| shares	(48)
Forfeited (in shares) \| shares	(24)
Nonvested, end of period (in shares) \| shares	127
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other Than Options Outstanding, Weighted Average Exercise Price [Roll Forward]
Grant Date Fair Value Per Share, Nonvested, beginning of period (in dollars per share) \| $ / shares	$ 39
Grant Date Fair Value Per Share, Granted (in dollars per share) \| $ / shares	38
Grant Date Fair Value Per Share, Vested (in dollars per share) \| $ / shares	37
Grant Date Fair Value Per Share, Forfeited (in dollars per share) \| $ / shares	35
Grant Date Fair Value Per Share, Nonvested, end of period (in dollars per share) \| $ / shares	$ 38

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for 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 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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