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Long-term Debt (Details) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 16, 2017 | Nov. 20, 2012 | Dec. 09, 2010 | Aug. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2017 | Feb. 21, 2017 | Feb. 20, 2017
Borrowings |  |  |  |  |  |  |  |  |  |
Repayments of revolving credit facility |  |  |  |  | $ 1,189,000,000.0 | $ 0 | $ 0 |  |  |
Unamortized discount and debt issuance costs |  |  |  |  | (13,800,000) | (3,600,000) |  |  |  |
Total long-term debt |  |  |  |  | 1,586,200,000 | 596,400,000 |  |  |  |
Less current portion of long-term debt |  |  |  |  | 0 | 0 |  |  |  |
Total long-term debt, net of current portion |  |  |  |  | 1,586,200,000 | 596,400,000 |  |  |  |
Proceeds from revolving credit facility |  |  |  |  | 1,189,000,000.0 | 0 | 0 |  |  |
Cash payments for interest |  |  |  |  | 29,600,000 | 35,900,000 | $ 35,100,000 |  |  |
3.75% Notes due 2027 |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.75% |  |  |  |  |  |  |  |  |
Long-term debt, carrying amount |  |  |  |  | $ 600,000,000.0 | 0 |  |  |  |
Par Value | $ 600,000,000.0 |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt | 597,600,000 |  |  |  |  |  |  |  |  |
Long-term debt redemption price, basis spread on variable discount rate (as a percent) |  |  |  |  | 0.25% |  |  |  |  |
Issuance costs including underwriter's, credit rating agencies' and attorneys' fees and other costs, which are included in other long-term assets | 7,700,000 |  |  |  |  |  |  |  |  |
Unamortized discount | $ (2,400,000) |  |  |  |  |  |  |  |  |
3.75% Notes due 2027 | Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  |  | $ 607,100,000 | 0 |  |  |  |
3.5% Notes due 2024 |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.50% |  |  |  |  |  |  |  |  |
Long-term debt, carrying amount |  |  |  |  | $ 400,000,000.0 | 0 |  |  |  |
Par Value | $ 400,000,000.0 |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt | 399,600,000 |  |  |  |  |  |  |  |  |
Long-term debt redemption price, basis spread on variable discount rate (as a percent) |  |  |  |  | 0.20% |  |  |  |  |
Issuance costs including underwriter's, credit rating agencies' and attorneys' fees and other costs, which are included in other long-term assets | 4,500,000 |  |  |  |  |  |  |  |  |
Unamortized discount | $ (400,000) |  |  |  |  |  |  |  |  |
3.5% Notes due 2024 | Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  |  | $ 403,700,000 | $ 0 |  |  |  |
3.75% senior notes due 2022 |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.75% |  |  | 3.75% | 3.75% |  |  |  |
Long-term debt, carrying amount |  |  |  |  | $ 350,000,000.0 | $ 350,000,000.0 |  |  |  |
Par Value |  | $ 350,000,000.0 |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | 348,900,000 |  |  |  |  |  |  |  |
Long-term debt redemption price, basis spread on variable discount rate (as a percent) |  |  |  |  | 0.35% |  |  |  |  |
Issuance costs including underwriter's, credit rating agencies' and attorneys' fees and other costs, which are included in other long-term assets |  | 2,900,000 |  |  |  |  |  |  |  |
Unamortized discount |  | $ (1,100,000) |  |  |  |  |  |  |  |
3.75% senior notes due 2022 | Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  |  | $ 358,900,000 | $ 347,200,000 |  |  |  |
5.125% senior notes due 2020 |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 5.125% |  | 5.125% | 5.125% |  |  |  |
Long-term debt, carrying amount |  |  |  |  | $ 250,000,000.0 | $ 250,000,000.0 |  |  |  |
Par Value |  |  | $ 250,000,000.0 |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  | 248,900,000 |  |  |  |  |  |  |
Long-term debt redemption price, description of variable discount rate |  |  |  |  | Treasury Rate |  |  |  |  |
Long-term debt redemption price, basis spread on variable discount rate (as a percent) |  |  |  |  | 0.35% |  |  |  |  |
Percentage of principal amount at which the entity may redeem some or all of the notes prior to specified date |  |  |  |  | 100.00% |  |  |  |  |
Percentage of principal amount at which the entity may redeem some or all of the notes after specified date |  |  |  |  | 100.00% |  |  |  |  |
Issuance costs including underwriter's, credit rating agencies' and attorneys' fees and other costs, which are included in other long-term assets |  |  | 1,900,000 |  |  |  |  |  |  |
Unamortized discount |  |  | $ (1,100,000) |  |  |  |  |  |  |
5.125% senior notes due 2020 | Change-in-control |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Percentage of the principal amount at which the notes are redeemable |  |  |  |  | 101.00% |  |  |  |  |
5.125% senior notes due 2020 | Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  |  | $ 264,800,000 | $ 263,100,000 |  |  |  |
6.125% senior notes due 2016 |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 6.125% |  | 6.125% |  |  |  |
Repayment of debt |  |  |  | $ 150,000,000.0 |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  | 1,000,000,000.0 |  |  |  |  |
Interest on borrowings |  |  |  |  | $ 0 | $ 0 |  |  |  |
Revolving credit facility | Credit Agreement |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 | $ 600,000,000.0
Debt Issuance Costs, Line of Credit Arrangements, Gross |  |  |  |  |  |  |  | $ 1,400,000 |  |
Line of Credit, Additional Borrowing Capacity |  |  |  |  |  |  |  |  |  | 500,000,000.0
Letter of Credit | Credit Agreement |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 50,000,000.0

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