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Equity Incentive Program - Stock Options and SSARs (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Expense	$ 7.4	$ 7.1	$ 14.1	$ 14.9
Share-based Payment Arrangement, Expense, Tax Benefit	0.3	0.3	3.0	3.2
Share-Based Payment Arrangement, Expense, after Tax	7.1	6.8	11.1	11.7
Stock Options, Weighted Average Exercise Price
Share-based Payment Arrangement, Expense, Tax Benefit	0.3	$ 0.3	3.0	$ 3.2
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 0.2		$ 0.2
Stock Options, Number of Shares
Beginning balance			2,104,356
Expired			(331,709)
Ending balance	1,762,322		1,762,322
Exercisable	1,705,929		1,705,929
Stock Options, Weighted Average Exercise Price
Beginning balance			$ 17.15
Expired			19.27
Ending balance	$ 16.77		16.77
Exercisable	$ 16.62		16.62
Exercised			$ 15.10
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period			(10,325)
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			7 months 6 days

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