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Convertible Notes - Narrative (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended
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Nov. 14, 2013 USD ($) item | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares
Convertible Senior Notes 0.375 Percent Due 2018 and Convertible Senior Notes 1.25 Percent Due 2020 |  |  |  |
Convertible Notes |  |  |  |
Number of days within 30 consecutive trading days in which the price of the entity's common stock must exceed the conversion price for the notes to be converted | 20 days |  |  |
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be convertible | 30 days |  |  |
Percentage of the closing sales price of common stock that the conversion price must exceed in order for the notes to be convertible (as a percent) | 130.00% |  |  |
Number of consecutive business days immediately after any five consecutive trading day period during the note measurement period | item | 5 |  |  |
Number of consecutive trading days before five consecutive business days during the note measurement period | item | 5 |  |  |
Conversion ratio, principal amount, denominator | 1,000 |  |  |
Percentage of the trading price to the product of the last reported sale price of the common stock and the conversion rate, maximum (as a percent) | 98.00% |  |  |
Fair value of premium stock issued and cash paid |  |  | $ 48.4 |
Convertible Senior Notes 0.375 Percent Due 2018 and Convertible Senior Notes 1.25 Percent Due 2020 | Director |  |  |  |
Convertible Notes |  |  |  |
Common stock issued in exchange of notes (in shares) | shares |  |  | 10,600,000 |
Convertible Senior Notes 0.375 Percent Due 2018 |  |  |  |
Convertible Notes |  |  |  |
Aggregate principal amount of notes | $ 375.0 |  |  |
Carrying value of notes |  |  | $ 7.4 |
Interest rate of debt (as a percent) |  | 0.375% | 0.375% | 0.375%
Conversion ratio, number of shares per principal amount |  | 0.1932070 |  |
Conversion ratio, principal amount, denominator |  | 1,000 |  |
Conversion price per share (in dollars per share) | $ / shares |  | $ 51.76 |  |
Liability on notes on the date of issuance | 299.4 |  |  |
Equity component in convertible notes | 75.6 |  |  |
Debt discount and issuance costs |  |  | $ 0.3 |
Aggregate principal amount of notes converted |  |  | $ 367.2 |
Common stock issued in exchange of notes (in shares) | shares |  | 148,761 | 7,201,058 | 114
Premium stock issued in exchange of notes (in shares) | shares |  |  | 100,000 |
Value of premium shares issued |  |  | $ 12.6 |
Cash used to fund redemption of notes |  |  | 2.0 |
Debt exchange expense |  | $ 1.4 |  |
Convertible Senior Notes 0.375 Percent Due 2018 | Director |  |  |  |
Convertible Notes |  |  |  |
Aggregate principal amount of notes | 250.0 |  |  |
Carrying value of notes |  |  |  | $ 259.0
Aggregate principal amount of notes converted |  |  | 259.0 |
Convertible Senior Notes 1.25 Percent Due 2020 |  |  |  |
Convertible Notes |  |  |  |
Aggregate principal amount of notes | 375.0 |  |  |
Carrying value of notes |  | $ 17.4 | $ 16.6 |
Interest rate of debt (as a percent) |  | 1.25% | 1.25% | 1.25%
Conversion ratio, number of shares per principal amount |  | 0.1932070 |  |
Conversion ratio, principal amount, denominator |  | 1,000 |  |
Conversion price per share (in dollars per share) | $ / shares |  | $ 51.76 |  |
Repurchase price as a percentage of principal |  | 100.00% |  |
Liability on notes on the date of issuance | 274.8 |  |  |
Equity component in convertible notes | 100.2 |  |  |
Debt discount and issuance costs |  | $ 1.7 | $ 2.5 |
Aggregate principal amount of notes converted |  |  | $ 355.6 |
Common stock issued in exchange of notes (in shares) | shares |  |  | 7,095,350 | 77
Premium stock issued in exchange of notes (in shares) | shares |  |  | 200,000 |
Value of premium shares issued |  |  | $ 26.8 |
Cash used to fund redemption of notes |  |  | 7.0 |
Debt exchange expense |  | $ 5.1 |  |
Convertible Senior Notes 1.25 Percent Due 2020 | Director |  |  |  |
Convertible Notes |  |  |  |
Aggregate principal amount of notes | $ 250.0 |  |  |
Carrying value of notes |  |  |  | $ 274.5
Aggregate principal amount of notes converted |  |  | $ 274.5 |

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- Definition Represents the percentage of the closing sales price of the common stock for at least 20 days within 30 consecutive trading days that the closing sales price of the common stock must exceed the conversion price in order for the debt instruments to be convertible. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. + 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 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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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(13)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: 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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- Definition The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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