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Long-Term Debt and Commercial Paper (Long-Term Debt) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Debt Instruments [Abstract]
Long-term debt		$ 1,789,400,000	$ 1,770,700,000
Less: unamortized debt discounts and debt issuance costs		(10,800,000)	(13,700,000)
Less: current maturities		(167,500,000)	(11,700,000)
Long-term debt, net of current maturities		1,611,100,000	1,745,300,000
Senior Notes at Six Point Seven Five Percent due 2018 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Senior notes		$ 400,000,000	400,000,000
Percentage interest on debt instrument		6.75%
Senior Notes at Five Point Five Percent Due 2020 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Senior notes		$ 350,000,000	350,000,000
Percentage interest on debt instrument		5.50%
Senior Notes at Three Point Three Five Percent Due 2021 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Senior notes		$ 300,000,000	300,000,000
Percentage interest on debt instrument		3.35%
Senior Notes at Four Point Five Percent Due 2025 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Senior notes		$ 450,000,000	450,000,000
Percentage interest on debt instrument		4.50%
Revolving Credit Facility Due 2019 [Member]
Debt Instruments [Abstract]
Revolving credit facility		$ 0	0
Mortgage Facility [Member]
Debt Instruments [Abstract]
Mortgage facility	[1]	153,200,000	175,700,000
Mortgage Facility [Member] | Secured Debt [Member]
Debt Instruments [Abstract]
Monthly principal and interest payments on mortgage facility		1,600,000
Balloon payment for mortgage		143,900,000
Capital Leases and Other Debt [Member]
Debt Instruments [Abstract]
Capital leases and other debt		$ 136,200,000	$ 95,000,000
[1] The mortgage facility requires monthly principal and interest payments of $1.6 million based on a fixed amortization schedule with a balloon payment of $143.9 million due November 2017.

X

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

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-Publisher FASB
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- Definition

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.

+ References

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- Definition

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

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- Definition

Amount of the required periodic payments including both interest and principal payments.

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- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

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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- Definition

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 and capital leases due within one year or the normal operating cycle, if longer.

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Amount of long-term debt and capital lease obligations including current maturities.

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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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