Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Schedule of financial instrument fair value

The estimated fair value of financial instruments at December 31, 2023 was as follows:

			Fair Value Measurements at Reporting Date Using
(In millions)	Total Carrying Amount		Total Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)
Cash and cash equivalents	$	743.9	$	743.9	$	743.9	$	—
Derivative financial instruments:
Assets	0.9		0.9		—		0.9
Liabilities	14.2		14.2		—		14.2
Debt (a)	2,199.2		2,746.7		2,438.9		307.8

The estimated fair value of financial instruments at January 1, 2023 was as follows:

			Fair Value Measurements at Reporting Date Using
(In millions)	Total Carrying Amount		Total Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)
Cash and cash equivalents	$	584.0	$	584.0	$	584.0	$	—
Derivative financial instruments:
Assets	18.0		18.0		—		18.0
Liabilities	4.6		4.6		—		4.6
Debt (a)	1,765.2		1,964.5		1,665.7		298.8

(a)The total carrying amount for debt excludes debt issuance costs related to the recognized debt liability which is presented in the consolidated balance sheets as a direct reduction from the carrying amount of the debt liability.