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Debt and Credit Agreements Long-Term Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 3,418,300,000 | $ 3,273,900,000
Long-term debt, current maturities | 502,500,000 | 502,000,000.0
Long-term debt, excluding current maturities | 2,915,800,000 | 2,771,900,000
Deb instrument, unamortized debt issuance costs | 24,300,000 | 21,600,000
Long-term debt, fair value | 3,995,000,000.0 | 3,565,500,000
3.50% Notes Due 2020 |  |
Debt Instrument [Line Items] |  |
Senior Notes | 500,000,000.0 |
Long-term debt, gross | $ 0 | 498,500,000
Interest rate, stated percentage | 3.50% |
Debt instrument, interest rate, effective percentage | 3.89% |
3.75% Notes Due 2021 (less unamortized discount and issuance costs of $0.1 and $0.8, respectively) |  |
Debt Instrument [Line Items] |  |
Senior Notes | $ 500,000,000.0 |
Long-term debt, gross | 499,100,000 | 497,900,000
Debt instrument, unamortized discount | 100,000 |
Deb instrument, unamortized debt issuance costs | $ 800,000 |
Debt instrument, maturity date | Oct. 01, 2021 |
Interest rate, stated percentage | 3.75% |
Debt instrument, interest rate, effective percentage | 3.98% |
4.00% Notes Due 2022 (less unamortized discount and issuance costs of $0.4 and $0.3, respectively) |  |
Debt Instrument [Line Items] |  |
Senior Notes | $ 250,000,000.0 |
Long-term debt, gross | 249,300,000 | 248,700,000
Debt instrument, unamortized discount | 400,000 |
Deb instrument, unamortized debt issuance costs | $ 300,000 |
Debt instrument, maturity date | Mar. 15, 2022 |
Interest rate, stated percentage | 4.00% |
Debt instrument, interest rate, effective percentage | 4.13% |
3.75% Notes Due 2023 (less unamortized discount and issuance costs of $0.3 and $0.9, respectively) |  |
Debt Instrument [Line Items] |  |
Senior Notes | $ 500,000,000.0 |
Long-term debt, gross | 498,800,000 | 498,200,000
Debt instrument, unamortized discount | 300,000 |
Deb instrument, unamortized debt issuance costs | $ 900,000 |
Debt instrument, maturity date | Feb. 15, 2023 |
Interest rate, stated percentage | 3.75% |
Debt instrument, interest rate, effective percentage | 4.32% |
4.20% Notes Due 2024 (less unamortized discount and issuance costs of $0.3 and $1.4, respectively) |  |
Debt Instrument [Line Items] |  |
Senior Notes | $ 500,000,000.0 |
Long-term debt, gross | 498,300,000 | 497,800,000
Debt instrument, unamortized discount | 300,000 |
Deb instrument, unamortized debt issuance costs | $ 1,400,000 |
Debt instrument, maturity date | Apr. 15, 2024 |
Interest rate, stated percentage | 4.20% |
Debt instrument, interest rate, effective percentage | 4.24% |
4.65% Notes Due 2028 (less unamortized discount and issuance costs of $1.3 and $3.5, respectively) |  |
Debt Instrument [Line Items] |  |
Senior Notes | $ 500,000,000.0 |
Long-term debt, gross | 495,200,000 | 494,600,000
Debt instrument, unamortized discount | 1,300,000 |
Deb instrument, unamortized debt issuance costs | $ 3,500,000 |
Debt instrument, maturity date | Oct. 01, 2028 |
Interest rate, stated percentage | 4.65% |
Debt instrument, interest rate, effective percentage | 4.78% |
4.75% Note Due 2030 (less unamortized discount and issuance costs of $3.5 and $5.7, respectively) |  |
Debt Instrument [Line Items] |  |
Senior Notes | $ 650,000,000.0 |
Long-term debt, gross | 640,800,000 | 0
Debt instrument, unamortized discount | 3,500,000 |
Deb instrument, unamortized debt issuance costs | $ 5,700,000 |
Debt instrument, maturity date | Mar. 30, 2030 |
Interest rate, stated percentage | 4.75% |
Debt instrument, interest rate, effective percentage | 4.92% |
5.40% Notes Due 2048 (less unamortized discount and issuance costs of $2.7 and $5.2, respectively) |  |
Debt Instrument [Line Items] |  |
Senior Notes | $ 500,000,000.0 |
Long-term debt, gross | 492,100,000 | 491,900,000
Debt instrument, unamortized discount | 2,700,000 |
Deb instrument, unamortized debt issuance costs | $ 5,200,000 |
Debt instrument, maturity date | Oct. 01, 2048 |
Interest rate, stated percentage | 5.40% |
Debt instrument, interest rate, effective percentage | 5.48% |
Other notes payable and capitalized leases |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 44,700,000 | $ 46,300,000

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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 Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 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(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 CCYY-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/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=117815213&loc=d3e19207-110258 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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