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Accumulated Other Comprehensive Loss - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2021
Equity [Abstract]
Cumulative income tax benefit on pension and postretirement benefit plans	$ 27.0	$ 27.0	$ 32.7
Cumulative income tax benefit on derivatives	10.7	10.7	$ 6.5
Curtailment gain	$ 0.6	$ 1.8

X

- Definition

Cumulative Other Comprehensive Income Loss, Gain (Loss) on Derivatives, Income Tax Expense (Benefit)

+ References

No definition available.

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X

- Definition

Cumulative Other Comprehensive Income Loss, Pension And Other Postretirement Benefit Plans, Income Tax Expense (Benefit)

+ References

No definition available.

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- References

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X

- Definition

Amount, after tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580

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