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Long-term Debt (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Borrowings
Unamortized discount, debt issuance costs, and other	$ (7,800,000)	$ (12,200,000)
Long-term debt	1,592,200,000	1,587,800,000
Less: current portion of long-term debt	2,800,000	0
Total long-term debt, net of current portion	1,589,400,000	1,587,800,000
Letters of credit outstanding	26,100,000	26,000,000.0
3.75% senior notes due 2027
Borrowings
Long-term debt, carrying amount	$ 600,000,000.0	$ 600,000,000.0
Interest rate (as a percent)	3.75%	3.75%
3.75% senior notes due 2027 | Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	$ 609,500,000	$ 579,400,000
3.5% senior notes due 2024
Borrowings
Long-term debt, carrying amount	$ 400,000,000.0	$ 400,000,000.0
Interest rate (as a percent)	3.50%	3.50%
3.5% senior notes due 2024 | Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	$ 407,400,000	$ 386,400,000
3.75% senior notes due 2022
Borrowings
Long-term debt, carrying amount	$ 350,000,000.0	$ 350,000,000.0
Interest rate (as a percent)	3.75%	3.75%
3.75% senior notes due 2022 | Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	$ 358,700,000	$ 345,500,000
5.125% senior notes due 2020
Borrowings
Long-term debt, carrying amount	$ 250,000,000.0	$ 250,000,000.0
Interest rate (as a percent)	5.125%	5.125%
5.125% senior notes due 2020 | Significant Observable Inputs (Level 2)
Borrowings
Fair value of notes	$ 256,900,000	$ 255,000,000.0
Revolving credit facility
Borrowings
Borrowings under the facility	0
Repayments of the facility	0
Revolving credit facility	0	0
Availability under revolving line of credit	1,000,000,000.0	$ 1,000,000,000.0
Letter of credit | Credit Agreement
Borrowings
Maximum borrowing capacity	80,000,000.0
Availability under revolving line of credit	$ 54,000,000.0

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

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts 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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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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