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Stock Based Compensation and Other Incentive Compensation - Performance Shares Activity (Details) - Performance Shares [Member] - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	$ 5.3
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years
EBITDA Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning balance	0.1	0.5	0.6
Performance shares granted	0.0	0.0	0.0
Performance shares vested	(0.1)	(0.4)	(0.1)
Performance shares canceled	0.0	0.0	0.0
Ending balance	0.0	0.1	0.5
Weighted-average grant date fair value outstanding	$ 0	$ 39.09	$ 34.49	$ 33.91
Weighted-average grant date fair value granted	0	0	0
Weighted-average grant date fair value vested	39.09	31.21	37.67
Weighted-average grant date fair value canceled	$ 0	$ 0	$ 0
Total Shareholder Return (TSR) Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning balance	0.8	0.8	0.6
Performance shares granted	0.0	0.3	0.3
Performance shares vested	(0.2)	(0.2)	(0.1)
Performance shares canceled	0.0	(0.1)	0.0
Ending balance	0.6	0.8	0.8
Weighted-average grant date fair value outstanding	$ 18.86	$ 20.13	$ 16.25	20.93
Weighted-average grant date fair value granted	0	24.36	13.91
Weighted-average grant date fair value vested	24.63	17.54	31.21
Weighted-average grant date fair value canceled	$ 0	$ 20.49	$ 0
Free Cash Flow (FCF) Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning balance	0.3	0.3	0.0
Performance shares granted	0.9	0.0	0.3
Performance shares vested	0.0	0.0	0.0
Performance shares canceled	0.0	0.0	0.0
Ending balance	1.2	0.3	0.3
Weighted-average grant date fair value outstanding	$ 7.50	$ 14.28	$ 14.28	$ 0
Weighted-average grant date fair value granted	5.18	0	14.28
Weighted-average grant date fair value vested	0	0	0
Weighted-average grant date fair value canceled	$ 0	$ 0	$ 0

X

- Definition

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 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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