Debt - Debt and Average Interest Rates on Debt Outstanding (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt, gross	$ 723.7
Unamortized debt issuance costs and discounts	(7.1)	$ (7.9)
Total debt	716.6	839.6
Line of Credit \| Term Loans Due 2023
Debt Instrument [Line Items]
Debt, gross	$ 200.0
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Average interest rate as of June 30, 2021	1.201%
Debt, gross	$ 16.1	36.1
Term Loans \| Term Loans Due 2023
Debt Instrument [Line Items]
Average interest rate as of June 30, 2021	1.149%
Debt, gross	$ 200.0	200.0
Senior Notes \| Senior Notes 5.000% Due 2021
Debt Instrument [Line Items]
Average interest rate as of June 30, 2021	5.00%
Debt, gross	$ 0.0	103.8
Senior Notes \| Senior Notes 3.150% Due 2022
Debt Instrument [Line Items]
Average interest rate as of June 30, 2021	3.15%
Debt, gross	$ 88.3	88.3
Senior Notes \| Senior Notes 4.650% Due 2025
Debt Instrument [Line Items]
Average interest rate as of June 30, 2021	4.65%
Debt, gross	$ 19.3	19.3
Senior Notes \| Senior Notes 4.500% Due 2029
Debt Instrument [Line Items]
Average interest rate as of June 30, 2021	4.50%
Debt, gross	$ 400.0	$ 400.0

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted average interest rate of debt outstanding.

+ References

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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