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Long-term Debt (Details) - USD ($) |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 16, 2017 | Nov. 20, 2012 | Dec. 09, 2010 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Feb. 21, 2017 | Feb. 20, 2017
Borrowings |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs |  |  |  | $ (8,400,000) | $ (12,200,000) |  |  |  |
Total long-term debt |  |  |  | 1,591,600,000 | 1,587,800,000 |  |  |  |
Current portion of debt |  |  |  | 250,200,000 | 0 |  |  |  |
Total long term-debt, net of current portion |  |  |  | $ 1,341,400,000 | 1,587,800,000 |  |  |  |
Percentage of principal amount at which the entity may redeem some or all of the notes prior to specified date |  |  |  | 100.00% |  |  |  |  |
Long-term debt redemption price, description of variable discount rate |  |  |  | Treasury Rate |  |  |  |  |
Percentage of principal amount at which the entity may redeem some or all of the notes after specified date |  |  |  | 100.00% |  |  |  |  |
Percentage of the principal amount at which the notes are redeemable, upon a change in control |  |  |  | 101.00% |  |  |  |  |
Proceeds from revolving credit facility |  |  |  | $ 0 | 0 | $ 1,189,000,000.0 |  |  |
Repayments of revolving credit facility |  |  |  | 0 | 0 | 1,189,000,000.0 |  |  |
Letters of credit outstanding |  |  |  | 25,500,000 | 26,000,000.0 |  |  |  |
Cash payments for interest |  |  |  | 63,700,000 | 65,400,000 | 29,600,000 |  |  |
3.75% Notes due 2027 |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |
Long-term debt, carrying amount |  |  |  | $ 600,000,000.0 | 600,000,000.0 |  |  |  |
Interest rate (as a percent) | 3.75% |  |  |  |  |  |  |  |
Par value | $ 600,000,000.0 |  |  |  |  |  |  |  |
Unamortized discount | 2,400,000 |  |  |  |  |  |  |  |
Proceeds from issuance of debt | 597,600,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Long-term debt redemption price, basis spread on variable discount rate (as a percent) |  |  |  | 25.00% |  |  |  |  |
3.75% Notes due 2027 | Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  | $ 623,400,000 | 579,400,000 |  |  |  |
3.5% Notes due 2024 |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |
Long-term debt, carrying amount |  |  |  | $ 400,000,000.0 | 400,000,000.0 |  |  |  |
Interest rate (as a percent) | 3.50% |  |  |  |  |  |  |  |
Par value | $ 400,000,000.0 |  |  |  |  |  |  |  |
Unamortized discount | 400,000 |  |  |  |  |  |  |  |
Proceeds from issuance of debt | 399,600,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Long-term debt redemption price, basis spread on variable discount rate (as a percent) |  |  |  | 20.00% |  |  |  |  |
3.5% Notes due 2024 | Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  | $ 414,200,000 | 386,400,000 |  |  |  |
3.75% senior notes due 2022 |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |
Long-term debt, carrying amount |  |  |  | $ 350,000,000.0 | 350,000,000.0 |  |  |  |
Interest rate (as a percent) |  | 3.75% |  |  |  |  |  |  |
Par value |  | $ 350,000,000.0 |  |  |  |  |  |  |
Unamortized discount |  | 1,100,000 |  |  |  |  |  |  |
Proceeds from issuance of debt |  | 348,900,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Long-term debt redemption price, basis spread on variable discount rate (as a percent) |  |  |  | 35.00% |  |  |  |  |
3.75% senior notes due 2022 | Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  | $ 361,400,000 | 345,500,000 |  |  |  |
5.125% senior notes due 2020 |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |
Long-term debt, carrying amount |  |  |  | $ 250,000,000.0 | 250,000,000.0 |  |  |  |
Interest rate (as a percent) |  |  | 5.125% |  |  |  |  |  |
Par value |  |  | $ 250,000,000.0 |  |  |  |  |  |
Unamortized discount |  |  | 1,100,000 |  |  |  |  |  |
Proceeds from issuance of debt |  |  | 248,900,000 |  |  |  |  |  |
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 |  |  |  |  |  |
Long-term debt redemption price, basis spread on variable discount rate (as a percent) |  |  |  | 35.00% |  |  |  |  |
5.125% senior notes due 2020 | Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  | $ 255,000,000.0 | 255,000,000.0 |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  | 1,000,000,000.0 |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |
Proceeds from revolving credit facility |  |  |  | 0 | 0 | 1,200,000,000 |  |  |
Repayments of revolving credit facility |  |  |  | 0 | $ 0 | $ 1,200,000,000 |  |  |
Revolving credit facility | Credit Agreement |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 1,000,000,000.0 | $ 600,000,000.0
Debt issuance costs on line of credit |  |  |  |  |  |  | $ 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 |
Letter of Credit | Revolving credit facility |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 80,000,000.0 |  |  |  |  |
Remaining borrowing capacity |  |  |  | $ 54,500,000 |  |  |  |  |

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