Share-Based Compensation Restricted Stock Award Activity (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended	12 Months Ended
Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Share-Based Compensation Expense and Cash Flows (Line Items)
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted In Period Fair Value	$ 79.8	$ 19.8	$ 18.2
Restricted Stock Units
Nonvested at December 31, 2018		2,641,087
Granted		664,899
Vested		(1,401,268)
Forfeited		(198,693)
Nonvested at December 31, 2019		1,706,025	2,641,087
Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2018		$ 24.87
Granted		29.75
Vested		23.40
Forfeited		30.96
Nonvested at December 31, 2019		$ 26.89	$ 24.87

Restricted Stock Units [Abstract]

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Share based compensation arrangement by share based payment award equity instruments other than options granted in period fair value.

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Weighted Average Grant-Date Fair Value [Abstract]

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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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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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