Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary Of Performance Shares Activity (Details)

Stock-Based Compensation - Summary Of Performance Shares Activity (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at Beginning of Period (in shares)	348,610
Target Shares Granted (in shares)	199,413
Target Shares Vested (in shares)	0
Target Shares Forfeited (in shares)	(54,160)
Outstanding at End of Period (in shares)	493,863
Weighted Average Grant Date Fair Value per Share (in dollars per share)	$ 25.04
2017 \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at Beginning of Period (in shares)	169,635
Target Shares Granted (in shares)	0
Target Shares Vested (in shares)	0
Target Shares Forfeited (in shares)	(18,143)
Outstanding at End of Period (in shares)	151,492
Weighted Average Grant Date Fair Value per Share (in dollars per share)	$ 10.73
2018 \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at Beginning of Period (in shares)	178,975
Target Shares Granted (in shares)	0
Target Shares Vested (in shares)	0
Target Shares Forfeited (in shares)	(17,341)
Outstanding at End of Period (in shares)	161,634
Weighted Average Grant Date Fair Value per Share (in dollars per share)	$ 27.51
2019 \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at Beginning of Period (in shares)	0
Target Shares Granted (in shares)	199,413
Target Shares Vested (in shares)	0
Target Shares Forfeited (in shares)	(18,676)
Outstanding at End of Period (in shares)	180,737
Weighted Average Grant Date Fair Value per Share (in dollars per share)	$ 34.82
Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit from compensation expense	$ 5.2	$ 3.8