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Long-term Debt (Details) - USD ($) |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2020 | Feb. 28, 2020 | Nov. 16, 2017 | Nov. 20, 2012 | Dec. 09, 2010 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Feb. 05, 2020
Borrowings |  |  |  |  |  |  |  |  |  |
Unamortized discount and debt issuance costs |  |  |  |  |  | $ (18,700,000) | $ (8,400,000) |  |  |
Total long-term debt |  |  |  |  |  | 2,081,300,000 | 1,591,600,000 |  |  |
Current portion of debt |  |  |  |  |  | 1,100,000 | 250,200,000 |  |  |
Total long term-debt, net of current portion |  |  |  |  |  | 2,080,200,000 | 1,341,400,000 |  |  |
Loss on extinguishment of debt |  |  |  |  |  | $ 8,800,000 | 0 | $ 0 |  |
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% |  |  |  |
Borrowings from revolving credit facility |  |  |  |  |  | $ 500,000,000.0 | 0 | 0 |  |
Repayments of revolving credit facility |  |  |  |  |  | 500,000,000.0 | 0 | 0 |  |
Letters of credit outstanding |  |  |  |  |  | 25,200,000 | 25,500,000 |  |  |
Cash payments for interest |  |  |  |  |  | 66,200,000 | 63,700,000 | 65,400,000 |  |
Senior Unsecured Debt |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Repayments of senior debt | $ 262,100,000 |  |  |  |  |  |  |  |  |
2.75% senior notes due 2030 |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Long-term debt, carrying amount |  |  |  |  |  | $ 750,000,000.0 | 0 |  |  |
Interest rate (as a percent) |  | 2.75% |  |  |  | 2.75% |  |  |  |
Par value |  | $ 750,000,000.0 |  |  |  |  |  |  |  |
Unamortized discount |  | 9,300,000 |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | 740,700,000 |  |  |  |  |  |  |  |
Issuance costs including underwriter's, credit rating agencies' and attorneys' fees and other costs, which are included in other long-term assets |  | 6,500,000 |  |  |  |  |  |  |  |
Accumulated loss on treasury locks |  | 16,400,000 |  |  |  |  |  |  |  |
Debt discount and issuance costs |  | $ 15,800,000 |  |  |  |  |  |  |  |
2.75% senior notes due 2030 | Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  |  |  | $ 804,800,000 | 0 |  |  |
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% |  |  | 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) |  |  |  |  |  | 20.00% |  |  |  |
3.75% Notes due 2027 | Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  |  |  | $ 679,300,000 | 623,400,000 |  |  |
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% |  |  | 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) |  |  |  |  |  | 25.00% |  |  |  |
3.5% Notes due 2024 | Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  |  |  | $ 438,300,000 | 414,200,000 |  |  |
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% |  | 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) |  |  |  |  |  | 20.00% |  |  |  |
3.75% senior notes due 2022 | Significant Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  |  |  | $ 366,900,000 | 361,400,000 |  |  |
5.125% senior notes due 2020 |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Long-term debt, carrying amount |  |  |  |  |  | $ 0 | 250,000,000.0 |  |  |
Interest rate (as a percent) |  |  |  |  | 5.125% | 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 |  |  |  |  |
Premium for early redemption | $ 8,400,000 |  |  |  |  |  |  |  |  |
Interest accrued to the redemption rate |  |  |  |  |  | $ 3,700,000 |  |  |  |
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 |  |  |  |  |  | $ 0 | 255,000,000.0 |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  |  |  | 0 |  |  |  |
Remaining borrowing capacity |  |  |  |  |  | 1,000,000,000.0 |  |  |  |
Borrowings from revolving credit facility |  |  |  |  |  | 500,000,000.0 | 0 | 0 |  |
Repayments of revolving credit facility |  |  |  |  |  | $ 500,000,000.0 | $ 0 | $ 0 |  |
Weighted average interest rate, over time |  |  |  |  |  | 1.90% |  |  |  |
Revolving credit facility | Fourth Amended and Restated Credit Agreement |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Debt issuance costs on line of credit |  |  |  |  |  |  |  |  | $ 1,300,000 |
Line of credit, additional borrowing capacity |  |  |  |  |  |  |  |  |  | $ 500,000,000.0
Letter of Credit | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 80,000,000.0 |  |  |  |
Remaining borrowing capacity |  |  |  |  |  | $ 54,900,000 |  |  |  |
Letter of Credit | Fourth Amended and Restated Credit Agreement |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 50,000,000.0

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- Definition The percentage of principal amount used in the computation of the redemption price at which the entity may redeem some or all of the debt instruments at any time before specified date. + References No definition available. + Details
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- Definition The percentage points added to the reference rate to compute the variable discount rate which is to be used to calculate present values of the remaining scheduled payments of principal and interest. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section S45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336 + Details
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- Definition Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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