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Debt - Summary of Debt (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 2,495.8 | $ 2,645.7
Less current portion | 0.0 | 150.0
Less unamortized debt issuance costs | 14.6 | 15.3
Long-term debt | $ 2,481.2 | $ 2,480.4
Weighted-average interest rate | 3.64% | 3.80%
6.50% Senior Notes due March 2018 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Long-term debt |  | $ 150.0
Stated interest rate |  | 6.50%
2.45% Senior Notes, due December 2020 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 499.5 | $ 499.5
Stated interest rate | 2.45% | 2.45%
3.90% Senior Notes, due June 2022 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 399.8 | $ 399.8
Stated interest rate | 3.90% | 3.90%
4.50% Senior Notes, due November 2023 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 698.9 | $ 698.8
Stated interest rate | 4.50% | 4.50%
3.65% Senior Notes, due September 2024 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 399.2 | $ 399.2
Stated interest rate | 3.65% | 3.65%
3.40% Senior Notes, due December 2027 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 498.4 | $ 498.4
Stated interest rate | 3.40% | 3.40%
Current Portion of Long-term Debt |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate | 0.00% | 6.50%
Long-term Debt, Excluding Current Portion |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate | 3.64% | 3.64%

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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