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Long-Term Debt and Commercial Paper (Long-Term Debt) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2015	Dec. 31, 2014
Long-term debt		$ 1,770.1	$ 2,128.4
Less: current maturities		(22.3)	(25.0)
Long-term debt, net of current maturities		1,747.8	2,103.4
6.75% Senior Notes Due 2018 [Member]
Senior notes		397.7	397.1
5.5% Senior Notes Due 2020 [Member]
Senior notes		350.0	350.0
3.35% Senior Notes due 2021 [Member]
Senior notes		300.0	0.0
4.5% Senior Notes due 2025 [Member]
Senior notes		448.5	0.0
Revolving Credit Facility Due 2019 [Member]
Revolving credit facility		0.0	1,110.0
Mortgage Facility [Member]
Mortgage facility	[1]	178.2	185.5
Capital Leases and Other Debt [Member]
Capital leases and other debt		95.7	$ 85.8
Secured Debt [Member] | Mortgage Facility [Member]
Monthly principal and interest payments on mortgage facility		1.7
Balloon payment for mortgage		$ 155.4
[1] The mortgage facility requires monthly principal and interest payments of $1.7 million based on a fixed amortization schedule with a balloon payment of $155.4 million due November 2017.

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- 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.

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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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