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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Amounts reclassified from accumulated other comprehensive loss to interest expense, income tax expense	$ (0.1)	$ (0.1)	$ (0.2)
Unrealized holding (losses) gains on available for sale debt securities, income tax expense (benefit)	(0.1)	1.8	0.4
Pension liability adjustments, income tax expense (benefit)	(0.7)	(5.2)	(8.3)
Income tax expense	$ 3.8	$ (1.0)	$ (0.7)

X

- Definition

Tax effect of the change in minimum pension liability.

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Other comprehensive income (loss), other, tax.

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Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-SubTopic 10
-Topic 220
-Publisher FASB
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-Name Accounting Standards Codification
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-Paragraph 10A
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A

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- Definition

Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-12

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482765/220-10-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
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