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Debt (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,025.0 | $ 650.0 |
Letters of Credit Outstanding, Amount | 18.2 | 18.2 |
Borrowing capacity remaining | $ 66.3 |  |
Unamortized Debt Issuance Expense |  | 18.1 |
Line of Credit [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 2,000.0
Covenant terms, minimum leverage ratio through September 2013 | 350.00% |  |
Covenant Terms Minimum Leverage Ratio Through Specified Date Following a Material Acquisition | 400.00% |  |
Long-Term Senior Notes [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt Instrument, Face Amount | $ 275.0 | $ 275.0 |
Debt Instrument, Interest Rate, Stated Percentage | 4.40% | 4.40% |
Unamortized Debt Issuance Expense | $ 2.3 | $ 2.7 |
Line of Credit [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,750.0 |  |
Pricing on the Facility based on market rates | LIBOR plus 0.95% to 2.05% |  |
Description of variable rate basis | LIBOR |  |
Basis spread on variable rate | 1.05% |  |
Average outstanding borrowings | $ 981.6 | $ 335.1 |
Line of credit, interest rate during period | 1.50% | 1.10% |
Covenant terms, minimum cash interest coverage ratio | 300.00% |  |
Unamortized Debt Issuance Expense | $ 19.6 | $ 15.4 |

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- Definition The minimum cash interest coverage ratio that must be maintained under the covenant terms of the Facility. + References No definition available. + Details
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- Definition The minimum leverage ratio that must be maintained through September 2013, under the covenant terms of the Facility. + References No definition available. + Details
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- Definition Covenant Terms Minimum Leverage Ratio Through Specified Date Following a Material Acquisition + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + 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 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 Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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(b),22(b)) -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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