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Long-Term Incentive Employee Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Long-Term Incentive Employee Compensation Costs
LTIP costs are primarily recorded within general and administrative expenses, at fair value over the requisite service period (typically three years) on a straight-line basis and are reduced by forfeitures as they occur. These costs impacted our consolidated results of operations as follows:
202020192018
Equity-based awards$13.4 $15.7 $21.6 
Liability-based awards0.8 2.8 1.5 
Total share-based compensation expense$14.2 $18.5 $23.1 
Rollforward of Outstanding Stock Options
A summary of activity related to our NQOs as of December 31, 2020, 2019 and 2018 is presented below.
 202020192018
Stock OptionsSharesWeighted
Average
Exercise
Price		SharesWeighted
Average
Exercise
Price		SharesWeighted
Average
Exercise
Price
Outstanding – January 10.3 $33.55 0.7 $35.04 0.9 $34.07 
Exercised(0.1)35.37 (0.4)36.08 (0.2)30.52 
Outstanding – December 310.2 $32.22 0.3 $33.55 0.7 $35.04 
Options exercisable – December 310.2 $32.22 0.3 $33.55 0.5 $36.04 
Share-Based Compensation Summary of Stock Options
The following table summarizes information about our outstanding and exercisable stock options at December 31, 2020.
Exercise PricesNumber of sharesWeighted
Average
Remaining
Contractual Life
(in years)		Aggregate
Intrinsic
Value
$19.97 - $26.760.1 1.6$3.7 
$33.01 - $43.520.1 4.43.7 
 0.2 3.2$7.4 
Rollforward of Outstanding Restricted Stock
The table below provides a rollforward of outstanding RSUs and PSUs for each of the years ended December 31, 2020, 2019 and 2018.
 202020192018
Restricted Stock and
Performance Units		SharesWeighted
Average
Grant Date
Fair Value		SharesWeighted
Average
Grant Date
Fair Value		SharesWeighted
Average
Grant Date
Fair Value
Outstanding – January 11.0 $51.24 1.2 $42.94 1.2 $38.74 
Granted0.3 61.13 0.3 60.91 0.4 54.79 
Performance adjustment(a)
0.1 57.88 0.1 44.87 — — 
Vested and issued(0.5)44.86 (0.6)38.03 (0.3)41.09 
Forfeited(0.1)59.50 — — (0.1)42.55 
Outstanding – December 310.8 $59.25 1.0 $51.24 1.2 $42.94 
Vested pending issuance0.2 $57.88 0.2 $44.87 0.2 $33.27 
(a)Represents an adjustment for performance results achieved related to outstanding PSU shares that vested during the period and are pending issuance.
Number of Outstanding Equity Settled RSUs, Cash Settled RSUs and RSAs
The table below provides the number of the outstanding shares by award type as of December 31, 2020, 2019 and 2018. Cash-settled PSUs outstanding are not material.
202020192018
Equity-settled RSUs0.4 0.5 0.7 
Cash-settled RSUs— 0.1 0.1 
Equity-settled PSUs0.4 0.4 0.4