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Changes in Stockholders' Equity (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jul. 31, 2019
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock repurchase program, outstanding balance authorized to be repurchased   $ 77.1
ASR Program [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Accelerated Share Repurchases, Settlement (Payment) or Receipt   $ 70.0
Stock Repurchased and Retired During Period, Shares   912,624
Subsequent Event [Member] | ASR Program [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Repurchased and Retired During Period, Shares 80,227