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Restricted stock shares and restricted stock units included in SLO Award target.

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Share based compensation arrangement by share based payment award cumulative stockholder return rate.

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- Definition

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

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Units

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Units Earn Out Percentage

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Share based compensation expense recognized period.

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Target level for the determination of performance goals and measures.

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Amount of noncash expense for share-based payment arrangement.

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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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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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- Definition

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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- Definition

Price of a single share of a number of saleable stocks of a company.

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Number of shares of stock issued during the period pursuant to acquisitions.

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Stockholders' Deficit - New Hire Equity Awards, Inducement Awards, Incentive Compensation and Other Awards (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	12 Months Ended
	Sep. 26, 2018	Sep. 18, 2017	Feb. 28, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target level for the determination of performance goals and measures				100.00%
Expense related to the SLO program				$ 32.9	$ 29.2	$ 44.9
Share based compensation expense recognized period					15 years
Forfeited (in shares)				110,984	86,518	184,235
2017 Performance-vesting New Hire Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value on grant date (in dollars per share)		$ 10.63
2016- 2018 PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance units paid out percentage			0.00%
Performance units paid out (in units)			0
SLO Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units granted (in shares)				6,321	109,841	136,783
Increments of cash bonus, percent				25.00%
Restricted stock shares and restricted stock units included in SLO Award target				71,663
Expense related to the SLO program				$ 3.2	$ 1.6	$ 1.1
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted and issued under the Omnibus Incentive Plan and Directors Stock Plan to Directors (in shares)				46,195
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued as part of acquisition (in shares)	20,000			0	20,000	0
Performance Share Unit Awards For Acquisitions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units granted (in shares)						30,506
Expense related to the SLO program				$ (0.4)	$ 0.3
Forfeited (in shares)				7,130	5,177
Chief Operating Officer and CEO-Designate \| Time Vesting New Hire Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units granted (in shares)		30,000
Fair value on grant date (in dollars per share)		$ 42.89
Chief Operating Officer and CEO-Designate \| 2017 Performance-vesting New Hire Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units granted (in shares)		70,000
Target level for the determination of performance goals and measures		100.00%
Chief Operating Officer and CEO-Designate \| Tranche One \| 2017 Performance-vesting New Hire Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative stockholder return rate		33.00%
Chief Operating Officer and CEO-Designate \| Minimum \| Tranche One \| 2017 Performance-vesting New Hire Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (in dollars per share)		$ 60.00
Chief Operating Officer and CEO-Designate \| Minimum \| Tranche Two \| 2017 Performance-vesting New Hire Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (in dollars per share)		$ 75.00