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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Allocation of Share-based Compensation Costs by Plan
The following table summarizes our stock-based compensation expense recorded within selling, general and administrative expenses for the years ended December 31:
($ in millions)202220212020
Stock option and appreciation rights$5.6 $12.5 $10.2 
Performance share units, stock-settled15.6 17.6 16.6 
Performance share units, cash-settled(0.1)1.0 0.4 
Performance share units, dividend equivalents0.1 0.2 0.6 
Employee stock purchase plan1.3 1.4 1.1 
Deferred compensation plans and restricted share awards1.2 4.8 5.1 
Total stock-based compensation expense$23.7 $37.5 $34.0 
Schedule of Stock Options Activity
The following table summarizes changes in outstanding options:
(in millions, except per share data)2022
Options outstanding, January 12.0 
Granted0.1 
Exercised(0.2)
Forfeited0.0 
Options outstanding, December 311.9 
Options vested and expected to vest, December 311.9 
Options vested and exercisable, December 311.5 

Weighted Average Exercise Price2022
Options outstanding, January 1$101.73 
Granted364.47 
Exercised83.77 
Forfeited224.26 
Options outstanding, December 31$118.72 
Options vested and expected to vest, December 31$116.88 
Options vested and exercisable, December 31$84.11 
Schedule of Stock Appreciation Rights Award Activity
The following table summarizes changes in outstanding SARs:
2022
SARs outstanding, January 121,054 
Granted520 
Exercised(1,169)
Forfeited(3)
SARs outstanding, December 3120,402 
SARs vested and expected to vest, December 3120,402 
SARs vested and exercisable, December 3117,450 

Weighted Average Exercise Price2022
SARs outstanding, January 1$88.18 
Granted369.13 
Exercised54.64 
Forfeited21.22 
SARs outstanding, December 31$97.28 
SARs vested and expected to vest, December 31$97.28 
SARs vested and exercisable, December 31$74.86 
Schedule of Nonvested Performance-based Share Activity
The following table summarizes changes in our outstanding stock-settled PSU awards:
2022
Non-vested stock-settled PSU awards, January 1164,474 
Granted at target level32,109 
Adjustments above/(below) target68,426 
Vested and converted(144,490)
Forfeited(7,966)
Non-vested stock-settled PSU awards, December 31112,553 
Weighted Average Fair Value2022
Non-vested stock-settled PSU awards, January 1$179.88 
Granted at target level362.40 
Adjustments above/(below) target106.57 
Vested and converted369.13 
Forfeited240.19 
Non-vested stock-settled PSU awards, December 31$278.38 
Schedule of Nonvested Performance-based Units Activity
The following table summarizes changes in our outstanding cash-settled PSU awards:
2022
Non-vested cash-settled PSU awards, January 11,318 
Granted at target level136 
Adjustments above/(below) target507 
Vested and converted(1,071)
Forfeited— 
Non-vested cash-settled PSU awards, December 31890 

Weighted Average Fair Value2022
Non-vested cash-settled PSU awards, January 1$169.53 
Granted at target level369.13 
Adjustments above/(below) target104.44 
Vested and converted369.13 
Forfeited— 
Non-vested cash-settled PSU awards, December 31$242.29