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Debt and Credit Agreements Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 1,604.6 | $ 1,612.2
Long-term Debt, Current Maturities |  | 323.9 | 1.9
Long-term Debt, Excluding Current Maturities |  | 1,280.7 | 1,610.3
Debt Instrument, Unamortized Debt Issuance Costs |  | 12.3 | 15.0
2.25% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  | 300.0 |
Long-term Debt, Gross |  | 299.4 | 298.8
Debt Instrument, Unamortized Discount |  | 0.1 |
Debt Instrument, Unamortized Debt Issuance Costs |  | 0.5 |
Long-term Debt, Fair Value | [1] | $ 301.4 | 299.3
Debt Instrument, Maturity Date |  | Nov. 15, 2017 |
Interest Rate, Stated Percentage |  | 2.25% |
Debt Instrument, Interest Rate, Effective Percentage |  | 2.30% |
4.00% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  | $ 250.0 |
Long-term Debt, Gross |  | 247.0 | 246.4
Debt Instrument, Unamortized Discount |  | 1.7 |
Debt Instrument, Unamortized Debt Issuance Costs |  | 1.3 |
Long-term Debt, Fair Value | [1] | $ 258.4 | 250.9
Debt Instrument, Maturity Date |  | Mar. 15, 2022 |
Interest Rate, Stated Percentage |  | 4.00% |
Debt Instrument, Interest Rate, Effective Percentage |  | 4.13% |
3.75% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  | $ 500.0 |
Long-term Debt, Gross |  | 496.6 | 496.0
Debt Instrument, Unamortized Discount |  | 0.9 |
Debt Instrument, Unamortized Debt Issuance Costs |  | 2.5 |
Long-term Debt, Fair Value | [1] | $ 503.3 | 484.8
Debt Instrument, Maturity Date |  | Feb. 15, 2023 |
Interest Rate, Stated Percentage |  | 3.75% |
Debt Instrument, Interest Rate, Effective Percentage |  | 4.32% |
4.20% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  | $ 500.0 |
Long-term Debt, Gross |  | 496.2 | 495.8
Debt Instrument, Unamortized Discount |  | 0.8 |
Debt Instrument, Unamortized Debt Issuance Costs |  | 3.0 |
Long-term Debt, Fair Value | [1] | $ 511.6 | 496.4
Debt Instrument, Maturity Date |  | Apr. 15, 2024 |
Interest Rate, Stated Percentage |  | 4.20% |
Debt Instrument, Interest Rate, Effective Percentage |  | 4.24% |
Notes Payable, Other Payables [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 65.4 | 75.2
Long-term Debt, Fair Value | [1] | $ 65.4 | $ 75.2
[1] | See Note 10 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/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + 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/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + 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/presentationRef -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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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/presentationRef -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 + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 + 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://www.xbrl.org/2003/role/presentationRef -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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- 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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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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