Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2019

Incentive Plan

Schedule of Deferred Compensation

Below is a summary of our compensation expense for the years ended December 31, 2019, 2018 and 2017 and our unearned compensation as of December 31, 2019 and December 31, 2018 (in millions):

																	Expected
																	period to
	Deferred Compensation												Unearned Compensation				recognize
	Expensed						Capitalized						As of		As of		unearned
	Year Ended December 31,						Year Ended December 31,						December 31,		December 31,		compensation
Type of incentive award	2019		2018		2017		2019		2018		2017		2019		2018		(in years)
Long-term incentive units	$	8.7	$	6.8	$	3.9	$	0.2	$	0.2	$	1.7	$	15.4	$	11.5	2.2
Market performance-based awards		13.0		12.7		9.6		0.8		0.8		2.3		28.4		24.8	2.5
Restricted stock		11.5		6.1		4.5		2.8		4.2		3.3		29.1		23.6	2.6

Schedule of weighted average fair value

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, 2019, 2018 and 2017:

	Weighted Average Fair Value at Date of Grant
Type of incentive award	2019		2018		2017
Long-term incentive units	$	116.22	$	101.86	$	109.71
Market performance-based awards	$	114.97	$	119.29	$	111.06
Restricted stock	$	115.25	$	100.33	$	108.65

Summary of Long-Term Incentive Unit Activity

Below is a summary of our long-term incentive unit activity for the year ended December 31, 2019.

		Weighted-Average
		Grant Date Fair
Unvested Long-term Incentive Units	Units	Value
Unvested, beginning of period	162,186	$	100.59
Granted	120,368		116.22
Vested	(55,039)		100.33
Cancelled or expired	(19,228)		97.32
Unvested, end of period	208,287	$	110.00

Market Performance Based Awards

		Market
		Performance
	RMS Relative	Vesting
Level	Market Performance	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 Valuation Assumptions

	Expected Stock Price		Risk-Free Interest
Award Date	Volatility		rate
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	%
January 1, 2019	23	%	2.44	%
February 21, 2019	23	%	2.48	%

Summary of Restricted Stock Activity

Below is a summary of our restricted stock activity for the year ended December 31, 2019.

		Weighted-Average
		Grant Date Fair
Unvested Restricted Stock	Shares	Value
Unvested, beginning of period	299,215	$	97.55
Granted (1)	226,902		115.25
Vested	(111,950)		93.38
Cancelled or expired	(41,375)		107.52
Unvested, end of period	372,792	$	108.47

(1) All restricted stock awards granted in 2019 are subject only to service conditions.