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Weighted Average Shares Outstanding (Tables)
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Weighted Average Shares Outstanding Weighted average shares outstanding are shown below:
Three months ended June 30,Six months ended June 30,
2021202020212020
Basic shares outstanding105.3 104.5 105.1 104.4 
Effect of potential common stock:
Common stock awards1.1 1.0 1.1 1.0 
Diluted shares outstanding106.4 105.5 106.2 105.4