Date of term loan repaid.

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Amount of the required periodic payments applied to interest and redemption premium payments paid (as they occur).

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Amount of amortization expense attributable to debt issuance costs.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Gross amount of debt extinguished.

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Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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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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Date the credit facility terminates, in CCYY-MM-DD format.

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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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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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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Debt - Additional Information (Details) - USD ($)							12 Months Ended
Debt - Additional Information (Details) - USD ($)	Dec. 13, 2017	Sep. 05, 2014	Oct. 22, 2013	Oct. 18, 2013	Jun. 26, 2012	Mar. 25, 2008	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Net proceeds used to repay outstanding debt	$ 997,800,000						$ 997,800,000	$ 385,000,000
Annual Principal Maturities for Debt [Abstract]
2018							150,000,000
2019							0
2020							500,000,000
2021							0
2022							400,000,000
2023 and thereafter							1,600,000,000
Interest payments							96,300,000	88,300,000
Interest payments and redemption premium payments paid for debt obligations									$ 85,500,000
Amortization of net (loss) gain on treasury lock							(5,700,000)	(5,700,000)	(5,700,000)
Amortization of financing costs							4,000,000	$ 1,800,000	1,800,000
Write-off of deferred debt issuance costs							1,800,000
Unsecured Debt
Debt Instrument [Line Items]
Remaining net proceeds used to pay debt issuance costs	6,800,000
Line of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity				$ 350,000,000
Unused borrowing capacity							326,900,000
Line of Credit \| Letter of Credit
Debt Instrument [Line Items]
Outstanding letters of credit							$ 23,100,000
2.45% Senior Notes, due December 2020 \| Senior Notes
Debt Instrument [Line Items]
Debt, face amount	$ 500,000,000
Stated interest rate	2.45%						2.45%	0.00%
Debt instrument, maturity date	Dec. 15, 2020						Dec. 15, 2020
3.40% Senior Notes, due December 2027 \| Senior Notes
Debt Instrument [Line Items]
Debt, face amount	$ 500,000,000
Stated interest rate	3.40%						3.40%	0.00%
Debt instrument, maturity date	Dec. 15, 2027						Dec. 15, 2027
Seven-Year Term Loan, due October 2020 \| Unsecured Debt
Debt Instrument [Line Items]
Debt, face amount				$ 650,000,000
Stated interest rate							0.00%	2.40%
Repayment of debt	$ 625,600,000						$ 630,500,000	$ 6,500,000	$ 6,500,000
Debt instrument, term							7 years	7 years	7 years
Date of term loan repaid				Dec. 13, 2017
Debt instrument, maturity date				Oct. 18, 2020			Oct. 18, 2020	Oct. 18, 2020	Oct. 18, 2020
Seven-Year Term Loan, due October 2020 \| Unsecured Debt \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Applicable margin				1.625%
Five-Year Term Loan, due August 2021 \| Unsecured Debt
Debt Instrument [Line Items]
Debt, face amount				$ 385,000,000
Stated interest rate							0.00%	2.02%
Repayment of debt	$ 350,400,000						$ 380,200,000	$ 4,800,000
Debt instrument, term				5 years			5 years	5 years
Credit facility, expiration date				Aug. 21, 2021			Aug. 21, 2021	Aug. 21, 2021
Date of term loan repaid				Dec. 13, 2017
Five-Year Term Loan, due August 2021 \| Unsecured Debt \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Applicable margin				1.25%
Five-Year and Seven-Year Term Loans, due October 2018 and 2020, respectively \| Unsecured Debt
Debt Instrument [Line Items]
Debt, face amount				$ 1,650,000,000
6.50% Senior Notes due March 2018 \| Senior Notes
Debt Instrument [Line Items]
Debt, face amount						$ 150,000,000
Stated interest rate						6.50%	6.50%	6.50%
Debt instrument, maturity date						Mar. 15, 2018	Mar. 15, 2018	Mar. 15, 2018
3.90% Senior Notes, due June 2022 \| Senior Notes
Debt Instrument [Line Items]
Debt, face amount					$ 400,000,000
Stated interest rate					3.90%		3.90%	3.90%
Debt instrument, maturity date					Jun. 15, 2022		Jun. 15, 2022	Jun. 15, 2022
4.50% Senior Notes, due November 2023 \| Senior Notes
Debt Instrument [Line Items]
Debt, face amount			$ 700,000,000
Stated interest rate			4.50%				4.50%	4.50%
Debt instrument, maturity date			Nov. 01, 2023				Nov. 01, 2023	Nov. 01, 2023
3.65% Senior Notes, due September 2024 \| Senior Notes
Debt Instrument [Line Items]
Debt, face amount		$ 400,000,000
Stated interest rate		3.65%					3.65%	3.65%
Debt instrument, maturity date		Sep. 15, 2024					Sep. 15, 2024	Sep. 15, 2024
Fixed-Rate Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Book value of fixed rate debt							$ 2,645,700,000
Long-term debt (fixed-rate debt), fair value							$ 2,734,900,000
Old Five-Year Term Loan \| Unsecured Debt
Debt Instrument [Line Items]
Repayment of debt								$ 25,000,000	$ 40,000,000
Debt instrument, term								5 years	5 years