Borrowings (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Borrowings
Par Value	$ 750.0	$ 750.0
Unamortized discount	(1.1)	(1.5)
Unamortized debt issuance costs	(2.9)	(3.1)
Total long-term debt	746.0	745.4
Less current portion of long-term debt	(150.0)	(149.8)
Total long-term debt, net of current portion	596.0	595.6
3.75% senior notes due 2022
Borrowings
Par Value	350.0	350.0
Unamortized discount	(0.7)	(0.8)
Unamortized debt issuance costs	(1.9)	(2.0)
Total long-term debt	347.4	347.2
Total long-term debt, net of current portion	$ 347.4	347.2
Interest rate (as a percent)	3.75%
3.75% senior notes due 2022 \| Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	$ 358.1
5.125% senior notes due 2020
Borrowings
Par Value	250.0	250.0
Unamortized discount	(0.4)	(0.6)
Unamortized debt issuance costs	(1.0)	(1.0)
Total long-term debt	248.6	248.4
Total long-term debt, net of current portion	$ 248.6	248.4
Interest rate (as a percent)	5.125%
5.125% senior notes due 2020 \| Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	$ 274.7
6.125% senior notes due 2016
Borrowings
Par Value	150.0	150.0
Unamortized discount		(0.1)
Unamortized debt issuance costs		(0.1)
Total long-term debt	150.0	149.8
Less current portion of long-term debt	$ (150.0)	(149.8)
Interest rate (as a percent)	6.125%
6.125% senior notes due 2016 \| Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	$ 150.9
Revolving credit facility
Borrowings
Maximum borrowing capacity	600.0
Amount outstanding	0.0	0.0
Uncommitted line of credit
Borrowings
Maximum borrowing capacity	45.0	45.0
Amount outstanding	$ 0.0	$ 0.0

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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The carrying value as of the balance sheet date of the current and noncurrent portions 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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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. 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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