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Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Statement Of Stockholders Equity [Abstract]
Tax effect on net change in pension asset/liability	$ 0.1		$ 0.3	$ 0.2	$ 0.2	$ 0.4
Net change in fair value of derivative instruments, tax	$ 1.6	$ 0.0	$ (28.9)	$ (8.2)	$ (7.1)	$ (4.4)

X

- Definition

Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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- Definition

Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

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