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Long-Term Debt (Narrative) (Description of 1.00% Notes) (Details) $ / shares in Units, shares in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 08, 2015 USD ($) | Dec. 31, 2016 USD ($) trading_day $ / shares shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs |  | $ 73,100,000 | $ 14,400,000 |
Conversion option recorded to equity |  |  | 107,500,000 |
Share repurchased value |  |  | 348,200,000 | $ 121,200,000
Repayments of Long-term Debt |  | 313,800,000 | 495,500,000 | 90,600,000
Conversion option, debt discount |  | (32,900,000) |  |
Payments for hedge |  | 0 | 108,900,000 | 0
Proceeds from issuance of warrants |  | $ 0 | $ 52,000,000 | $ 0
1.00% Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate (as a percent) |  | 1.00% | 1.00% |
Debt issuance costs |  | $ 11,300,000 | $ 13,900,000 |
Convertible Debt [Member] | 1.00% Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt | $ 690,000,000 |  |  |
Debt instrument, interest rate (as a percent) | 1.00% | 1.00% |  |
Debt issuance costs | $ 18,300,000 |  |  |
Debt issuance costs | 15,400,000 |  |  |
Conversion option recorded to equity | 2,900,000 |  |  |
Share repurchased value |  |  | $ 70,000,000 |
Repayments of Long-term Debt | $ 350,000,000 |  |  |
Debt instrument, convertible, conversion ratio (in shares) |  | 54.0643 |  |
Debt conversion, original debt amount |  | $ 1,000 |  |
Conversion price per share (in dollars per share) | $ / shares |  | $ 18.50 |  |
Redemption price percentage |  | 100.00% |  |
Conversion option, debt discount |  | $ 110,400,000 |  |
Effective interest rate (as a percent) |  | 4.29% |  |
Convertible note hedge |  | $ 56,900,000 |  |
Exercise price, warrants (in dollars per share) | $ / shares |  | $ 25.96 |  |
Proceeds from issuance of warrants |  | $ 52,000,000 |  |
Convertible Debt [Member] | 1.00% Notes [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Conversion price per share (in dollars per share) | $ / shares |  | $ 18.50 |  |
Number of convertible shares | shares |  | 37.3 |  |
Payments for hedge |  | $ 108,900,000 |  |
Debt Conversion One [Member] | Convertible Debt [Member] | 1.00% Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Threshold trading days | trading_day |  | 20 |  |
Threshold consecutive trading days |  | 30 days |  |
Threshold percentage of stock price trigger (greater than or equal to) |  | 130.00% |  |
Debt Conversion Two [Member] | Convertible Debt [Member] | 1.00% Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Threshold consecutive trading days |  | 5 days |  |
Period immediately following consecutive trading days (in business days) |  | 5 days |  |
Ratio of trading price per 1000 principal amount (as a percent) (less than) |  | 0.98 |  |

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- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from recognition of deferred taxes for convertible debt with a beneficial conversion feature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=75116239&loc=d3e34017-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Beneficial Conversion Feature -URI http://asc.fasb.org/extlink&oid=6505963 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51819886&loc=SL6014347-161799 + Details
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