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Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Accumulated Other Comprehensive Income
Beginning balance	$ 1,496.1	$ 1,461.8	$ 1,428.6	$ 1,430.4	$ 1,413.9	$ 1,409.7	$ 1,428.6	$ 1,409.7
Other comprehensive income before reclassifications	4.2			8.9			27.1	(3.2)
Amounts reclassified from accumulated other comprehensive loss	0.5			0.4			1.5	0.9
Net current-period other comprehensive income (loss)	4.7	10.4	13.5	9.3	(8.1)	(3.5)	28.6	(2.3)
Ending balance	1,521.1	1,496.1	1,461.8	1,457.9	1,430.4	1,413.9	1,521.1	1,457.9
Total
Accumulated Other Comprehensive Income
Beginning balance	(41.5)	(51.9)	(65.4)	(33.8)	(25.7)	(22.2)	(65.4)	(22.2)
Net current-period other comprehensive income (loss)	4.7	10.4	13.5	9.3	(8.1)	(3.5)
Ending balance	(36.8)	(41.5)	(51.9)	(24.5)	(33.8)	(25.7)	(36.8)	(24.5)
Unrealized Translation Adjustments
Accumulated Other Comprehensive Income
Beginning balance	17.5		(5.4)	12.0		24.1	(5.4)	24.1
Other comprehensive income before reclassifications	4.2			8.9			27.1	(3.2)
Amounts reclassified from accumulated other comprehensive loss	0.0			0.0			0.0	0.0
Net current-period other comprehensive income (loss)	4.2			8.9			27.1	(3.2)
Ending balance	21.7	17.5		20.9	12.0		21.7	20.9
Pension Plans
Accumulated Other Comprehensive Income
Beginning balance	(59.0)		$ (60.0)	(45.8)		$ (46.3)	(60.0)	(46.3)
Other comprehensive income before reclassifications	0.0			0.0			0.0	0.0
Amounts reclassified from accumulated other comprehensive loss	0.5			0.4			1.5	0.9
Net current-period other comprehensive income (loss)	0.5			0.4			1.5	0.9
Ending balance	$ (58.5)	$ (59.0)		$ (45.4)	$ (45.8)		$ (58.5)	$ (45.4)

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