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Recently Issued Accounting Standards - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Jan. 01, 2019	Aug. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease liabilities	$ 139.8
Effect of health care cost trend rate			1.00%
Accounting Standards Update 2017-12 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 177.2
Operating lease liabilities		$ 182.6
Accounting Standards Update 2018 02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 8.6

X

- Definition

Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
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+ References

No definition available.

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
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- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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