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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Schedule of Compensation Expense
Stock-based compensation cost by award type follows:
(in millions)Three Months Ended
March 31,
20222021
Stock option awards$3.1 $3.6 
Restricted stock awards3.3 2.2 
Performance share awards3.2 2.5 
Stock appreciation rights— 3.1 
Total stock-based compensation cost incurred9.6 11.4 
Capitalized cost during the period— (3.4)
Amortization of capitalized cost during the period— 5.5 
Total stock-based compensation expense
$9.6 $13.5