Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Stock Repurchase Activity) (Details)

v3.10.0.1
Earnings Per Share (Stock Repurchase Activity) (Details)
$ / shares in Units, $ in Millions
1 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Shares  
Treasury Stock, As of June 1, 2018 (in shares) | shares 0
Treasury Stock, Acquired, For the month ended June 30, 2018 (in shares) | shares 200,000
Treasury Stock, As of June 30, 2018 (in shares) | shares 245,630
Cost  
Treasury Stock, Cost, As of June 1, 2018 | $ $ 0.0
Treasury Stock, Cost, For the month ended June 30, 2018 | $ 15.0
Treasury Stock, Cost, As of June 30, 2018 | $ $ 15.0
Average Price Per Share  
Treasury Stock, Average Price Per Share, As of June 1, 2018 (in usd per share) | $ / shares $ 0.00
Treasury Stock, Average Price Per Share, For the month ended June 30, 2018 (in usd per share) | $ / shares 61.07
Treasury Stock, Average Price Per Share, As of June 30, 2018 (in usd per share) | $ / shares $ 61.07