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Equity - Reconciliation of accumulated other comprehensive loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (Decrease) in Equity [Roll Forward]
Beginning balance			$ 643.5
Total other comprehensive income (loss), net of income tax	$ (9.1)	$ 15.0	(21.1)	$ 11.9
Ending balance	649.0		649.0
Gains and Losses on Cash Flow Hedges
Increase (Decrease) in Equity [Roll Forward]
Beginning balance	(0.2)	0.1
Other comprehensive income (loss) before reclassifications	(0.8)		(0.9)	(0.2)
Amounts reclassified from accumulated other comprehensive income (loss)	0.3		0.2	0.3
Total other comprehensive income (loss), net of income tax	(0.5)		(0.7)	0.1
Ending balance	(0.7)	0.1	(0.7)	0.1
Pension & Postretirement
Increase (Decrease) in Equity [Roll Forward]
Beginning balance	(49.7)	(38.1)	(47.9)	(39.9)
Other comprehensive income (loss) before reclassifications	(0.8)	(1.1)	(3.6)	(0.1)
Amounts reclassified from accumulated other comprehensive income (loss)	0.5	0.6	1.5	1.4
Total other comprehensive income (loss), net of income tax	(0.3)	(0.5)	(2.1)	1.3
Ending balance	(50.0)	(38.6)	(50.0)	(38.6)
Foreign Currency Translation
Increase (Decrease) in Equity [Roll Forward]
Beginning balance	(59.6)	(86.1)	(49.6)	(81.1)
Other comprehensive income (loss) before reclassifications	(8.3)	15.5	(18.3)	10.5
Total other comprehensive income (loss), net of income tax	(8.3)	15.5	(18.3)	10.5
Ending balance	(67.9)	(70.6)	(67.9)	(70.6)
Accumulated Other Comprehensive Loss
Increase (Decrease) in Equity [Roll Forward]
Beginning balance	(109.5)	(124.1)	(97.5)	(121.0)
Other comprehensive income (loss) before reclassifications	(9.9)	14.4	(22.8)	10.2
Amounts reclassified from accumulated other comprehensive income (loss)	0.8	0.6	1.7	1.7
Total other comprehensive income (loss), net of income tax	(9.1)	15.0	(21.1)	11.9
Ending balance	$ (118.6)	$ (109.1)	$ (118.6)	$ (109.1)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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