Shareholders' Equity (Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024		Sep. 30, 2025		Sep. 30, 2024
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense		$ (8.2)	$ (10.5)		$ (25.3)		$ (30.6)
Tax impact		(23.2)	(26.9)		(72.3)		(68.4)
Derivative (Loss) Gain [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total (income), net of tax	[1],[2]	(0.1)	(1.0)		(0.4)		(3.6)
Pension And Postretirement Adjustments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total (income), net of tax	[1]	0.6	(0.6)	[2]	1.9	[2]	(1.9)	[2]
Reclassification From Accumulated Other Comprehensive Loss [Member] | Derivative (Loss) Gain [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Tax impact		0.0	0.4		0.1		1.1
Total (income), net of tax		(0.1)	(1.0)		(0.4)		(3.6)
Reclassification From Accumulated Other Comprehensive Loss [Member] | Derivative (Loss) Gain [Member] | Interest Rate Swap Contracts, Before Tax [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense		(0.1)	(1.4)		(0.5)		(4.7)
Reclassification From Accumulated Other Comprehensive Loss [Member] | Amortization of prior service credit [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other non-operating (income), net		0.0	(0.1)		(0.1)		(0.2)
Reclassification From Accumulated Other Comprehensive Loss [Member] | Amortization of net actuarial loss (gain) [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other non-operating (income), net		0.9	(0.9)		2.8		(2.5)
Reclassification From Accumulated Other Comprehensive Loss [Member] | Pension And Postretirement Adjustments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Tax impact		(0.3)	0.4		(0.8)		0.8
Total loss (income), before tax		0.9	(1.0)		2.7		(2.7)
Total loss (income), net of tax		0.6	(0.6)		1.9		(1.9)
Total reclassifications for the period		$ 0.5	$ (1.6)		$ 1.5		$ (5.5)

[1] Amounts are net of tax.

[2] Amounts include our 50% share of AOCL components from our WAVE joint venture.