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Debt and Credit Agreements Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 3,660.3 | $ 1,287.6
Long-term debt, current maturities |  | 0.1 | 2.0
Long-term debt, excluding current maturities |  | 3,660.2 | 1,285.6
Deb instrument, unamortized debt issuance costs |  | 26.0 | 13.0
Long-term debt, fair value |  | 3,643.6 |
3.50% Notes Due 2020 (less unamortized discount and issuance costs of $0.9 and $2.9, respectively) |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes |  | 500.0 |
Long-term debt, gross |  | 496.6 | 0.0
Debt instrument, unamortized discount |  | 0.8 |
Deb instrument, unamortized debt issuance costs |  | 2.6 |
Long-term debt, fair value |  | $ 499.9 | 0.0
Debt instrument, maturity date |  | Oct. 01, 2020 |
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 $0.3 and $3.2, respectively) |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes |  | $ 500.0 |
Long-term debt, gross |  | 496.8 | 0.0
Debt instrument, unamortized discount |  | 0.3 |
Deb instrument, unamortized debt issuance costs |  | 2.9 |
Long-term debt, fair value |  | $ 503.2 | 0.0
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 $1.1 and $0.9, respectively) |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes |  | $ 250.0 |
Long-term debt, gross |  | 248.2 | 247.6
Debt instrument, unamortized discount |  | 1.0 |
Deb instrument, unamortized debt issuance costs |  | 0.8 |
Long-term debt, fair value | [1] | $ 250.3 | 259.0
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 $0.7 and $1.8, respectively) |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes |  | $ 500.0 |
Long-term debt, gross |  | 497.7 | 497.1
Debt instrument, unamortized discount |  | 0.6 |
Deb instrument, unamortized debt issuance costs |  | 1.7 |
Long-term debt, fair value | [1] | $ 491.4 | 513.2
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 $0.6 and $2.3, respectively) |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes |  | $ 500.0 |
Long-term debt, gross |  | 497.3 | 496.7
Debt instrument, unamortized discount |  | 0.5 |
Deb instrument, unamortized debt issuance costs |  | 2.2 |
Long-term debt, fair value | [1] | $ 492.6 | 524.2
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 $1.7 and $4.4, respectively) |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes |  | $ 500.0 |
Long-term debt, gross |  | 494.0 | 0.0
Debt instrument, unamortized discount |  | 1.7 |
Deb instrument, unamortized debt issuance costs |  | 4.3 |
Long-term debt, fair value |  | $ 494.1 | 0.0
Debt instrument, maturity date |  | Oct. 01, 2028 |
Interest rate, stated percentage |  | 4.65% |
Debt instrument, interest rate, effective percentage |  | 4.78% |
5.40% Notes Due 2048 (less unamortized discount and issuance costs of $2.8 and $5.6, respectively) |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes |  | $ 500.0 |
Long-term debt, gross |  | 491.7 | 0.0
Debt instrument, unamortized discount |  | 2.8 |
Deb instrument, unamortized debt issuance costs |  | 5.5 |
Long-term debt, fair value |  | $ 474.1 | 0.0
Debt instrument, maturity date |  | Oct. 01, 2048 |
Interest rate, stated percentage |  | 5.40% |
Debt instrument, interest rate, effective percentage |  | 5.48% |
Term Loan Due 2021 (LIBOR plus 1.25%) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | $ 400.0 |
Loans Payable, Fair Value Disclosure |  | 400.0 |
Other notes payable and capitalized leases |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross |  | 38.0 | 46.2
Long-term debt, fair value | [1] | $ 38.0 | $ 46.2
[1] | See Note 12 for information on the fair value measurement of our long-term debt.

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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=109500613&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=6879938&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=6877327&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=6876686&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=109500613&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=114775744&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=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&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=6877327&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=99377789&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=6877327&loc=d3e13212-122682 + Details
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