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Other Comprehensive (Loss) Income - Components of Accumulated Comprehensive Loss (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ 635.7	$ 653.0	$ 649.6	$ 628.5	$ 607.4	$ 597.7
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(123.9)	$ (106.3)	(111.9)	$ (128.2)	$ (137.0)	$ (122.6)
Net gain (loss) on pension and OPEB liability adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, tax benefit	11.6		11.6
Accumulated other comprehensive loss	(17.1)		(20.5)
Unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, tax benefit	2.1		2.8
Accumulated other comprehensive loss	(7.8)		(13.1)
Unrealized (loss) gain on foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, tax benefit	6.6		10.1
Accumulated other comprehensive loss	$ (99.0)		$ (78.3)

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Amount of tax expense (benefit) allocated to accumulated 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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