Debt - Debt Outstanding and Average Interest Rates (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt, gross	$ 847.5
Unamortized issuance costs and discounts	(7.9)	$ (9.9)
Total debt	839.6	1,029.1
Commercial Paper
Debt Instrument [Line Items]
Debt, gross	$ 0.0	117.8
Line of Credit \| Revolving credit facilities
Debt Instrument [Line Items]
Average interest rate at end of period	1.244%
Debt, gross	$ 36.1	35.8
Term loans \| Term Loans, 1.224% due in 2023
Debt Instrument [Line Items]
Average interest rate at end of period	1.224%
Debt, gross	$ 200.0	200.0
Senior Notes \| Senior Notes 3.625% due 2020
Debt Instrument [Line Items]
Average interest rate at end of period	3.625%
Debt, gross	$ 0.0	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
Debt Instrument [Line Items]
Average interest rate at end of period	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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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Amount of unamortized debt discount (premium) and debt issuance costs.

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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.

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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
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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