Comprehensive Income (Loss) (Changes in AOCL) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Changes in AOCI by component (net of tax) [Roll Forward]
Beginning balance	$ 1,163.1
Other comprehensive income (loss) before reclassifications	8.1
Amounts reclassified from AOCL	(7.6)
Net other comprehensive income (loss)	0.5
Ending balance	1,213.9
Share of Equity Method Investments Other Comprehensive Income
Changes in AOCI by component (net of tax) [Roll Forward]
Beginning balance	0.2
Amounts reclassified from AOCL	0.0
Net other comprehensive income (loss)	0.0
Ending balance	0.2
Defined Benefit Pension Plan Items [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Beginning balance	(46.8)
Other comprehensive income (loss) before reclassifications	(0.7)
Amounts reclassified from AOCL	0.7
Net other comprehensive income (loss)	0.0
Ending balance	(46.8)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Beginning balance	(19.8)
Other comprehensive income (loss) before reclassifications	(0.7)
Amounts reclassified from AOCL	0.0
Net other comprehensive income (loss)	(0.7)
Ending balance	(20.5)
Accumulated Other Comprehensive Loss
Changes in AOCI by component (net of tax) [Roll Forward]
Beginning balance	(48.5)
Ending balance	(48.0)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Changes in AOCI by component (net of tax) [Roll Forward]
Beginning balance	17.9
Other comprehensive income (loss) before reclassifications	9.5
Amounts reclassified from AOCL	(8.3)
Net other comprehensive income (loss)	1.2
Ending balance	$ 19.1