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Long-Term Debt and Commercial Paper (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Expense |  |  | $ 10.1
Letters of credit, amount outstanding |  | $ 44.1 |
Commercial paper, maximum aggregate amount outstanding permitted |  | 1,000.0 |
Commercial paper, amount outstanding |  | 958.1 | 599.5
3.35% Senior Notes due 2021 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes Amount Outstanding |  | $ 300.0 |
Percentage interest on debt instrument |  | 3.35% |
Debt instrument, maturity date |  | Jan. 15, 2021 |
4.5% Senior Notes due 2025 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes Amount Outstanding |  | $ 448.6 |
Percentage interest on debt instrument |  | 4.50% |
Debt instrument, maturity date |  | Oct. 01, 2025 |
6.75% Senior Notes Due 2018 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes Amount Outstanding |  | $ 398.3 |
Percentage interest on debt instrument |  | 6.75% |
Debt instrument, maturity date |  | Apr. 15, 2018 |
5.5% Senior Notes Due 2020 [Member] | Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes Amount Outstanding |  | $ 350.0 |
Percentage interest on debt instrument |  | 5.50% |
Debt instrument, maturity date |  | Feb. 01, 2020 |
Revolving Credit Facility Due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity under revolving credit facility |  | $ 1,800.0 |
Additional borrowing capacity under accordion feature of revolving credit facility |  | 500.0 |
Revolving credit facility, amount outstanding |  | 0.0 | 0.0
Revolving credit facilities letter of credit sublimit |  | 200.0 |
Additional borrowing capacity under the revolving credit facility |  | 1,800.0 |
Borrowing capacity limited under the maximum consolidated leverage ratio |  | $ 1,100.0 |
Leverage ratio, minimum threshold, current credit spread |  | 2.0 |
Leverage ratio, maximum threshold, current credit spread |  | 3.25 |
Leverage ratio, minimum threshold, increase in credit spread |  | 3.25 |
Impact on credit spread from increase in leverage ratio |  | 0.125% |
Revolving Credit Facility Due 2019 [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, maturity date |  | Dec. 03, 2019 |
Mortgage Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage facility | [1] | $ 170.6 | 175.7
Mortgage Facility [Member] | Secured Debt [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 |  | $ 1.7 |
Balloon payment for mortgage |  | 155.4 |
Capital Leases and Other Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Capital leases and other debt |  | $ 91.8 | $ 95.0
Minimum [Member] | Revolving Credit Facility Due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee on undrawn amounts |  | 0.175% |
Maximum [Member] | Revolving Credit Facility Due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee on undrawn amounts |  | 0.25% |
Commercial Paper [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average annual interest rate |  | 1.29% |
Commercial Paper [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity period of debt |  | 397 days |
Commercial Paper [Member] | Weighted Average [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity period of debt |  | 23 days |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Revolving Credit Facility Due 2019 [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable interest rates |  | 1.25% |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Revolving Credit Facility Due 2019 [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable interest rates |  | 1.625% |
Base Rate [Member] | Minimum [Member] | Revolving Credit Facility Due 2019 [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable interest rates |  | 0.25% |
Base Rate [Member] | Maximum [Member] | Revolving Credit Facility Due 2019 [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable interest rates |  | 0.625% |
[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 Maximum amount of increase in the revolving credit facility allowed under the accordion feature of the credit agreement, subject to credit availability and certain other conditions. + References No definition available. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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