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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted			247,073
Stock-Based Compensation Activity
Income tax benefit	$ 0.6	$ 0.7	$ 1.1	$ 1.5
Treasury Stock, Shares, Acquired			255,000
Treasury Stock Acquired, Average Cost Per Share			$ 38.04
Performance Shares [Member]
Stock-Based Compensation Activity
Compensation expense	2.1	2.7	$ 4.0	5.4
Restricted stock units
Stock-Based Compensation Activity
Compensation expense	0.2	0.2	0.3	0.5
Share-based Payment Arrangement [Member]
Stock-Based Compensation Activity
Compensation expense	2.3	2.9	4.3	5.9
Total Shareholder Return [Member] | Performance Shares [Member]
Stock-Based Compensation Activity
Compensation expense	2.0	2.3	3.7	4.5
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]
Stock-Based Compensation Activity
Compensation expense	$ 0.1	$ 0.4	$ 0.3	$ 0.9

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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