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Other Comprehensive Income - Components of Accumulated Comprehensive Income (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ 562.1	$ 557.9	$ 562.1	$ 546.7
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(123.8)	(124.5)	$ (78.6)	$ (89.4)
Unrealized gain (loss) on pension and OPEB liability adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(27.7)	(28.2)
Accumulated other comprehensive loss, tax benefit	12.5	11.4
Unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(1.1)	(0.6)
Accumulated other comprehensive loss, tax benefit	1.6	1.6
Unrealized (loss) gain on foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(95.0)	(95.7)
Accumulated other comprehensive loss, tax benefit	$ 4.0	$ 1.7

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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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