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Long-Term Debt and Commercial Paper (Senior Unsecured Notes and Credit Agreement) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jul. 29, 2021
Debt Instrument [Line Items] |  |  |  |  |
Letters of credit, amount outstanding |  | $ 39.7 |  |  |
Senior Notes at Three Point Three Five Percent Due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayment of senior notes |  | 300.0 | $ 0.0 | $ 0.0 |
Revolving Credit Facility Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity under revolving credit facility |  | 1,800.0 |  |  |
Additional borrowing capacity under accordion feature of revolving credit facility |  | 500.0 |  |  |
Revolving credit facilities letter of credit sublimit |  | 200.0 |  |  |
Additional borrowing capacity under revolving credit facility |  | $ 1,800.0 |  |  |
Leverage ratio, minimum threshold, current credit spread |  | 2.0 |  |  |
Leverage ratio, maximum threshold, current credit spread |  | 3.25 |  |  |
Leverage ratio, minimum threshold, increase in credit spread |  | 3.25 |  |  |
Impact on credit spread from increase in leverage ratio |  | 0.125% |  |  |
Senior Notes [Member] | Senior Notes at Three Point Three Five Percent Due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayment of senior notes | $ 300.0 |  |  |  |
Senior notes |  | $ 0.0 | $ 300.0 |  |
Percentage interest on debt instrument |  | 3.35% | 3.35% |  |
Debt instrument, maturity date |  | Jan. 15, 2021 |  |  |
Senior Notes [Member] | Senior Notes at Three Point Five Percent Due 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes |  | $ 450.0 | $ 450.0 |  |
Percentage interest on debt instrument |  | 3.50% |  |  |
Debt instrument, maturity date |  | Nov. 15, 2024 |  |  |
Senior Notes [Member] | Senior Notes at Four Point Five Percent Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes |  | $ 450.0 | 450.0 |  |
Percentage interest on debt instrument |  | 4.50% |  |  |
Debt instrument, maturity date |  | Oct. 01, 2025 |  |  |
Senior Notes [Member] | Senior Notes at Three Point Eight Percent Due 2027 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes |  | $ 300.0 | 300.0 |  |
Percentage interest on debt instrument |  | 3.80% |  |  |
Debt instrument, maturity date |  | Nov. 15, 2027 |  |  |
Senior Notes [Member] | Senior Notes at One Point Nine Five Percent Due 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes |  | $ 400.0 | 0.0 |  | $ 400.0
Percentage interest on debt instrument |  | 0.0195% |  |  |
Senior notes, aggregate offering price percentage |  |  |  |  | 99.805%
Debt instrument, maturity date |  | Aug. 01, 2028 |  |  |
Senior Notes [Member] | Senior Notes at Four Point Seven Five Percent Due 2030 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes |  | $ 500.0 | 500.0 |  |
Percentage interest on debt instrument |  | 4.75% |  |  |
Debt instrument, maturity date |  | Jun. 01, 2030 |  |  |
Senior Notes [Member] | Senior Notes at Two Point Four Percent Due 2031 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes |  | $ 450.0 | $ 0.0 |  | $ 450.0
Percentage interest on debt instrument |  | 2.40% |  |  |
Senior notes, aggregate offering price percentage |  |  |  |  | 99.735%
Debt instrument, maturity date |  | Aug. 01, 2031 |  |  |
Line of Credit [Member] | Revolving Credit Facility Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, maturity date |  | Mar. 26, 2025 |  |  |
Minimum [Member] | Revolving Credit Facility Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee on undrawn amounts (percent) |  | 0.125% |  |  |
Maximum [Member] | Revolving Credit Facility Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee on undrawn amounts (percent) |  | 0.20% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rates (percent) |  | 1.125% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rates (percent) |  | 1.50% |  |  |
Base Rate [Member] | Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rates (percent) |  | 0.125% |  |  |
Base Rate [Member] | Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rates (percent) |  | 0.50% |  |  |

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- Definition The minimum, inclusive, leverage ratio, as defined in the credit agreement, in which the credit spread on the revolver would increase based on the pricing terms outlined in the agreement. + 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=123466204&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 Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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