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Equity Incentive Program (Tables)
6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Schedule of Black-Scholes Option-Pricing Assumptions
The expense related to stock options granted in the six months ended June 30, 2021 and 2020 was estimated on the date of grant using a Black-Scholes option-pricing model based on the assumptions shown in the table below:
 Six Months Ended June 30,
 20212020
Risk-free interest rate0.06%0.16%to1.42%
Dividend yield—%—%
Expected life (years)4.54.3to4.5
Volatility36.0%38.8%to40.6%
Fair value at date of grant$6.14to$6.31$4.78to$5.95
Schedule of SSAR and Stock Options Activity The following table summarizes the Company's stock-settled stock appreciation right ("SSAR") and stock option activity for the six months ended June 30, 2021 (in millions, except share and per share amounts):
 SSARsStock Options
 Number of SharesWeighted-Average Exercise PriceAggregate Intrinsic ValueWeighted-Average Remaining Contractual Term (Years)Number of SharesWeighted-Average Exercise PriceAggregate Intrinsic ValueWeighted-Average Remaining Contractual Term (Years)
Outstanding at December 31, 2020596,537 $22.72 5,765,903 $17.44 
Granted— — 216,963 20.61 
Exercised— — (649,044)16.15 
Forfeited— — (78,869)17.05 
Expired(106,477)22.17 (838,666)29.53 
Outstanding at June 30, 2021490,060 $22.84 $— 1.14,416,287 $15.49 $19.1 3.1
Exercisable at June 30, 2021490,060 $22.84 $— 1.13,451,454 $14.92 $16.7 2.4
Schedule of Restricted Stock Units Award Activity
The following table summarizes the Company's restricted stock unit ("RSU") activity for the six months ended June 30, 2021:
 Share unitsWeighted-average grant date fair value
Unvested at December 31, 20201,909,786 $16.14 
Granted1,010,984 20.65 
Vested (1)
(874,641)15.54 
Forfeited(92,733)17.79 
Unvested at June 30, 20211,953,396 $18.61 
(1) The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy statutory tax withholding requirements.
Share-based Payment Arrangement, Performance Shares, Outstanding Activity
The following table summarizes the Company's PSU activity for the six months ended June 30, 2021:
 Share unitsWeighted-average grant date fair value
Unvested at December 31, 2020920,973 $16.04 
Granted277,183 28.46 
Vested (1)
(329,092)13.75 
Forfeited(84,493)17.16 
Unvested at June 30, 2021784,571 $21.27 
(1) The number of PSUs vested includes shares that the Company withheld on behalf of employees to satisfy statutory tax withholding requirements.