Accumulated Other Comprehensive Loss - Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Settlement gain	$ 0.7	$ 8.7	$ 5.6	$ 6.7
Provision for income taxes	26.5	19.5	82.1	52.4
Total net of tax	76.1	59.6	247.5	150.7
Reclassification out of Accumulated Other Comprehensive Income \| Pension and other postretirement obligations
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Settlement gain	0.0	(10.0)	0.0	(10.0)
Provision for income taxes	0.0	2.0	0.0	2.0
Total net of tax	$ 0.0	$ (8.0)	$ 0.0	$ (8.0)

Amount after tax of income (loss) from continuing operations attributable to the parent.

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+ Details

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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+ Details