Debt - Debt Outstanding and Average Interest Rates (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt, gross	$ 792.7
Unamortized issuance costs and discounts	(5.1)	$ (6.8)
Total debt	$ 787.6	1,440.7
Commercial Paper
Debt Instrument [Line Items]
Average interest rate at end of period	3.248%
Debt, gross	$ 76.0	34.0
Line of Credit \| Revolving credit facilities
Debt Instrument [Line Items]
Average interest rate at end of period	3.703%
Debt, gross	$ 26.2	28.4
Senior Notes \| Senior notes 2.900% due 2018
Debt Instrument [Line Items]
Average interest rate at end of period	2.90%
Debt, gross	$ 0.0	255.3
Total debt		255.3
Senior Notes \| Senior Notes 2.650% due 2019
Debt Instrument [Line Items]
Average interest rate at end of period	2.65%
Debt, gross	$ 250.0	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	$ 155.1	594.4
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%
Debt Instrument [Line Items]
Average interest rate at end of period	4.65%
Debt, gross	$ 19.3	$ 19.3

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.

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-Name Accounting Standards Codification
-Topic 470
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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
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