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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		9 Months Ended
	Aug. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 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	$ 1.3	$ 1.7	$ 2.8
Treasury Stock, Shares, Acquired			150,000		405,000
Treasury Stock Acquired, Average Cost Per Share	$ 33.14	$ 38.04
Performance Shares [Member]
Stock-Based Compensation Activity
Compensation expense			$ 2.1	4.6	$ 6.1	10.0
Restricted stock units
Stock-Based Compensation Activity
Compensation expense			0.3	0.3	0.6	0.8
Share-based Payment Arrangement [Member]
Stock-Based Compensation Activity
Compensation expense			2.4	4.9	6.7	10.8
Total Shareholder Return [Member] | Performance Shares [Member]
Stock-Based Compensation Activity
Compensation expense			1.9	2.3	5.6	6.8
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member]
Stock-Based Compensation Activity
Compensation expense			$ 0.2	$ 2.3	$ 0.5	$ 3.2

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

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