Debt - Debt Outstanding and Average Interest Rates (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt, gross	$ 1,039.0
Unamortized issuance costs and discounts	(9.9)	$ (5.1)
Total debt	$ 1,029.1	787.6
Commercial Paper
Debt Instrument [Line Items]
Average interest rate at end of period	2.327%
Debt, gross	$ 117.8	76.0
Line of Credit \| Revolving credit facilities
Debt Instrument [Line Items]
Average interest rate at end of period	2.863%
Debt, gross	$ 35.8	26.2
Term Loans [Member] \| Term Loans, 2.914% due in 2023
Debt Instrument [Line Items]
Average interest rate at end of period	2.914%
Debt, gross	$ 200.0	0.0
Senior Notes \| Senior Notes 2.650% due 2019
Debt Instrument [Line Items]
Average interest rate at end of period	2.65%
Debt, gross	$ 0.0	250.0
Senior Notes \| Senior Notes 2.450% due 2019
Debt Instrument [Line Items]
Average interest rate at end of period	2.45%
Debt, gross	$ 0.0	155.1
Senior Notes \| Senior Notes 3.625% due 2020
Debt Instrument [Line Items]
Average interest rate at end of period	3.625%
Debt, gross	$ 74.0	74.0
Senior Notes \| Senior Notes, 5.000% due 2021
Debt Instrument [Line Items]
Average interest rate at end of period	5.00%
Debt, gross	$ 103.8	103.8
Senior Notes \| Senior Notes 3.150% due 2022
Debt Instrument [Line Items]
Average interest rate at end of period	3.15%
Debt, gross	$ 88.3	88.3
Senior Notes \| Senior Notes, 4.650% due in 2025
Debt Instrument [Line Items]
Average interest rate at end of period	4.65%
Debt, gross	$ 19.3	19.3
Senior Notes \| Senior Notes, 4.500% due in 2029 [Member]
Debt Instrument [Line Items]
Average interest rate at end of period	4.50%
Debt, gross	$ 400.0	$ 0.0

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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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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Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

Weighted average interest rate of debt outstanding.

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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=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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