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Senior Debt (Details) - USD ($) | Sep. 22, 2015 | Sep. 30, 2015 | Feb. 13, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Long-term debt |  |  |  |
Senior notes |  | $ 1,084,500,000 |  | $ 736,800,000
Credit Facilities | Line of Credit | Revolver |  |  |  |
Long-term debt |  |  |  |
Maximum borrowing capacity | $ 1,300,000,000.0 |  |  |
Potential increase in maximum borrowing capacity | 500,000,000.0 |  |  |
Credit Facilities | Line of Credit | Term Loan |  |  |  |
Long-term debt |  |  |  |
Maximum borrowing capacity | 350,000,000.0 |  |  |
Potential increase in maximum borrowing capacity | 100,000,000.0 |  |  |
3.50% Senior Notes Due 2025 | Senior Notes |  |  |  |
Long-term debt |  |  |  |
Aggregate principal amount |  |  | $ 350,000,000 |
Interest rate |  |  | 3.50% |
5.25% Senior Notes Due 2022 | Senior Notes |  |  |  |
Long-term debt |  |  |  |
Senior notes | $ 140,000,000 |  |  |
Interest rate | 5.25% |  |  |
Redemption price as a percentage of principle amount | 100.00% |  |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + 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 210.7-03.16(a)) -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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