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v3.6.0.2

Debt - Senior Notes (Details) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 USD ($) | Feb. 28, 2013 USD ($) $ / shares | Dec. 31, 2016 USD ($) d $ / shares | Dec. 31, 2015 USD ($) | Jan. 31, 2017 USD ($) | Aug. 02, 2016 USD ($) | Nov. 10, 2015 USD ($) | Jun. 30, 2015 USD ($)
5.375% Senior Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of contractual interest rate |  |  | 5.375% |  |  |  |  |
1.125% Cash Convertible Senior Notes due 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of contractual interest rate |  |  | 1.125% |  |  |  |  |
1.625% Convertible Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of contractual interest rate |  |  | 1.625% |  |  |  |  |
Senior Notes | 5.375% Senior Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 700,000,000 |
Percentage of contractual interest rate |  |  |  |  |  |  | 5.375% |
Senior Notes | 1.125% Cash Convertible Senior Notes due 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  | $ 550,000,000 |  |  |  |  |  |
Percentage of contractual interest rate |  | 1.125% |  |  |  |  |  |
Current portion of long-term debt to be converted within 12 months |  |  | $ 471,000,000 |  |  |  |  |
Debt instrument, conversion ratio |  | 0.0245277 |  |  |  |  |  |
Debt instrument conversion price per share | $ / shares |  | $ 40.77 |  |  |  |  |  |
Senior note effective interest rate (in percent) |  |  | 6.00% |  |  |  |  |
Senior notes amortization period |  |  | 3 years |  |  |  |  |
If-converted value in excess of principal on convertible debt |  |  | $ 182,000,000 | $ 332,000,000 |  |  |  |
Senior Notes | 3.75% Convertible Senior Notes due 2014 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, conversion ratio | 0.0172157 |  |  |  |  |  |  |
Convertible Debt | 1.625% Convertible Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term of debt instrument |  |  | 4 years |  |  |  |  |
Principal amount | $ 301,551,000.000 |  |  |  |  |  |  |
Debt instrument conversion price per share | $ / shares |  |  | $ 58.09 |  |  |  |  |
Senior note effective interest rate (in percent) |  |  | 5.00% |  |  |  |  |
If-converted value in excess of principal on convertible debt |  |  |  | $ 10,000,000 |  |  |  |
Proceeds from issuance of debt | $ 125,000,000.0 |  |  |  |  |  |  |
Frequency of periodic payment |  |  | semiannually |  |  |  |  |
Increase of interest rate contingent on principal amount outstanding | 0.25% |  |  |  |  |  |  |
Minimum principal amount outstanding threshold for interest rate increase |  |  | $ 100,000,000 |  |  |  |  |
Debt redemption price, percentage of principal amount |  |  | 100.00% |  |  |  |  |
Convertible debt discount amortization period |  |  | 1 year 7 months |  |  |  |  |
Convertible debt, carrying amount of equity component |  |  | $ 23,000,000 |  |  |  |  |
Redemption period, option one | Senior Notes | 1.125% Cash Convertible Senior Notes due 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt convertible threshold trading days | d |  |  | 20 |  |  |  |  |
Debt convertible threshold consecutive trading days |  |  | 30 days |  |  |  |  |
Debt convertible threshold percentage of stock price trigger |  |  | 130.00% |  |  |  |  |
Redemption period, option one | Convertible Debt | 1.625% Convertible Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt convertible threshold trading days | d |  |  | 20 |  |  |  |  |
Debt convertible threshold consecutive trading days |  |  | 30 days |  |  |  |  |
Debt convertible threshold percentage of stock price trigger |  |  | 130.00% |  |  |  |  |
Redemption period, option two | Senior Notes | 1.125% Cash Convertible Senior Notes due 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt convertible threshold trading days | d |  |  | 5 |  |  |  |  |
Debt convertible threshold consecutive trading days |  |  | 5 days |  |  |  |  |
Debt convertible maximum threshold percentage of stock price |  |  | 98.00% |  |  |  |  |
Redemption period, option two | Convertible Debt | 1.625% Convertible Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt convertible threshold trading days | d |  |  | 5 |  |  |  |  |
Debt convertible threshold consecutive trading days |  |  | 5 days |  |  |  |  |
Debt convertible maximum threshold percentage of stock price |  |  | 98.00% |  |  |  |  |
Revolving Credit Facility | Unsecured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term of debt instrument |  |  | 5 years |  |  |  |  |
Potential maximum borrowing capacity |  |  |  |  |  |  |  | $ 650,000,000
Amount outstanding under Letter of Credit |  |  | $ 0 |  |  |  |  |
Revolving Credit Facility | Unsecured Debt | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 500,000,000 |  |  |
Current borrowing capacity |  |  |  |  | 494,000,000 |  |  |
Letter of Credit | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount outstanding under Letter of Credit |  |  |  |  | $ 6,000,000 |  |  |
Letter of Credit | Debt Commitment Letter |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 400,000,000 |  |

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- Definition Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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