Operations and Summary of Significant Accounting Policies (Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), net of reclassification adjustments	$ 95.0	$ (31.3)	$ 39.5
AOCI Attributable To Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax amount	92.0	(33.4)	67.5
Other comprehensive income (loss), income taxes	3.0	1.2	(27.6)
Other comprehensive income (loss), net of reclassification adjustments	95.0	(32.2)	39.9
Defined benefit pension plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax amount	(10.0)	(2.0)	110.1
Other comprehensive income (loss), income taxes	2.6	1.2	(27.2)
Other comprehensive income (loss), net of reclassification adjustments	(7.4)	(0.8)	82.9
Deferred gains and losses on derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax amount	(0.3)	(0.5)	2.5
Other comprehensive income (loss), income taxes	0.4	0.0	(0.4)
Other comprehensive income (loss), net of reclassification adjustments	0.1	(0.5)	2.1
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax amount	102.3	(30.9)	(45.1)
Other comprehensive income (loss), income taxes	0.0	0.0	0.0
Other comprehensive income (loss), net of reclassification adjustments	102.3	(30.9)	(45.1)
AOCI Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), net of reclassification adjustments	0.0	0.9	(0.4)
Defined benefit pension plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), net of reclassification adjustments	0.0	0.0	0.0
Deferred gains and losses on derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), net of reclassification adjustments	0.0	0.0	0.0
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), net of reclassification adjustments	$ 0.0	$ 0.9	$ (0.4)