Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2017	Dec. 31, 2016
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Short-term borrowings	$ 629.3	$ 426.8
Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents	104.1	72.4
Short-term borrowings	629.3	426.8
Contingent consideration	17.8	0.0
Fair value adjustment asset (liability) related to hedged fixed rate debt instrument	0.0	0.2
Fair Value \| Fair Value, Inputs, Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents	104.1	72.4
Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value adjustment asset (liability) related to hedged fixed rate debt instrument	0.0	0.2
Short-term borrowings	629.3	426.8
Fair Value \| Fair Value, Inputs, Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Contingent consideration	17.8	0.0
2.875% Senior notes due October 1, 2022 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	399.8	399.8
2.875% Senior notes due October 1, 2022 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	404.0	396.9
2.45% Senior notes due December 15, 2019 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	299.9	299.9
2.45% Senior notes due December 15, 2019 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	303.1	302.0
Variable term loan due September 27, 2018
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Variable term loan due September 27, 2018	200.0	0.0
Variable term loan due September 27, 2018 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Variable term loan due September 27, 2018	200.0	0.0
Variable term loan due September 27, 2018 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Variable term loan due September 27, 2018	$ 200.0	$ 0.0

Amount of liability recognized arising from contingent consideration in a business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value of contingent consideration in a business combination that is classified in shareholders' equity.

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Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

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Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

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No definition available.

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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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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

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