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Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments

Below is a summary of our compensation expense for the years ended December 31, 2018, 2017 and 2016 and our unearned compensation as of December 31, 2018 and December 31, 2017 (in millions):



	Deferred Compensation												Unearned Compensation				Expected period to recognize unearned compensation (in years)
	Expensed						Capitalized						As of December 31, 2018		As of December 31, 2017
	Year Ended December 31,						Year Ended December 31,
Type of incentive award	2018		2017		2016		2018		2017		2016
Long-term incentive units	$	6.8	$	3.9	$	4.5	$	0.2	$	1.7	$	1.8	$	11.5	$	6.9	2.9
Market performance-based awards	12.7		9.6		7.9		0.8		2.3		1.9		24.8		24.7		2.5
Restricted stock	6.1		4.5		4.1		4.2		3.3		2.8		23.6		17.5		2.7

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

The following table sets forth the weighted average fair value of for each type of incentive award at the date of grant for the years ended December 31, 2018, 2017 and 2016:



	Weighted Average Fair Value at Date of Grant
Type of incentive award	2018		2017		2016
Long-term incentive units	$	101.86	$	109.71	$	87.18
Market performance-based awards	$	119.29	$	111.06	$	82.90
Restricted stock	$	100.33	$	108.65	$	83.58

Schedule of Nonvested Performance-based Units Activity

Below is a summary of our long-term incentive unit activity for the year ended December 31, 2018.



Unvested Long-term Incentive Units	Units		Weighted-Average Grant Date Fair Value Per Unit
Unvested, beginning of period	99,295		$	90.59
Granted	128,986		101.86
Vested	(51,820	)	88.88
Cancelled or expired	(15,356	)	83.93
Unvested, end of period	161,105		$	100.94

Schedule of Share-based Compensation, Performance Based Awards

In the event that the RMS Relative Market Performance during the Market Performance Period is achieved at the “threshold,” “target” or “high” level as set forth below, the awards will become vested as to the market condition with respect to the percentage of Class D units or RSUs, as applicable, set forth below:



Level	RMS Relative Market Performance	Market Performance Vesting Percentage
Below Threshold Level	< -300 basis points	0	%
Threshold Level	-300 basis points	25	%
Target Level	100 basis points	50	%
High Level	> 500 basis points	100	%

Schedule of Share-Based Payment Award Valuation Assumptions

Assumptions used in the valuations are summarized as follows:



Award Date	Expected Stock Price Volatility	Risk-Free Interest Rate
January 1, 2016	22%	1.32%
February 16, 2016	26%	0.89%
January 1, 2017	25%	1.49%
February 28, 2017	23%	1.43%
January 1, 2018	22%	1.98%
March 1, 2018	22%	2.34%
March 9, 2018	22%	2.42%

Schedule of Restricted Stock Activity

Below is a summary of our restricted stock activity for the year ended December 31, 2018.



Unvested Restricted Stock	Shares		Weighted-Average Grant Date Fair Value Per Share
Unvested, beginning of period	259,422		$	90.54
Granted ⁽¹⁾	168,192		100.33
Vested	(96,840	)	83.63
Cancelled or expired	(35,273	)	97.96
Unvested, end of period	295,501		$	97.49


(1)	All restricted stock awards granted in 2018 are subject only to service conditions.

- Definition

Tabular disclosure of an equity-based arrangement (such as stock or unit options and stock or unit awards) with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain equity-based awards at future dates, sometimes including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares or units issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability.

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