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Long-Term Debt and Commercial Paper (Other Debt) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Mortgage Facility [Member]
Debt Instrument [Line Items]
Mortgage facility	[1]	$ 153.2	$ 175.7
Capital Leases and Other Debt [Member]
Debt Instrument [Line Items]
Capital leases and other debt		$ 136.2	$ 95.0
Secured Debt [Member] | Mortgage Facility [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		Nov. 30, 2017
Mortgage facility, fixed interest rate		5.864%
Number of years of mortgage loans		10 years
Monthly principal and interest payments on mortgage facility		$ 1.6
Balloon payment for mortgage		$ 143.9
[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.

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Term of mortgages on certain of our store properties that secure our mortgage facility.

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
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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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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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The interest rate applicable to 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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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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