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Debt (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2013
Line of Credit Facility [Line Items] |  |  |  |
Interest rate description |  | Borrowings under the 2016 Credit Agreement bear interest at (1) a base rate plus a margin of 0.00% to 0.75%, based on certain financial tests or (2) United States dollar LIBOR (0.52% at September 30, 2016) plus 1.00% to 1.75%, based on certain financial tests. The base rate is determined by the greater of (a) the prime commercial lending rate announced by Bank of Montreal from time to time (3.50% at September 30, 2016), (b) the federal funds effective rate, plus ½ of 1.00%, (c) the daily one month LIBOR rate, plus 1.00%, or (d) 0.00%. The interest rate in effect at September 30, 2016 was 1.77%. Fees for letters of credit issued under the 2016 Revolving Credit Facility range from 1.00% to 1.75% of the respective face amounts of outstanding letters of credit and are computed based on certain financial tests. |  |
Letters of credit outstanding (in US dollars) | $ 115,400,000 | $ 115,400,000 | $ 99,000,000 |
Borrowings under revolving credit facility (in US dollars) | 125,000,000 | $ 125,000,000 | 0 |
2013 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Write off of deferred debt issuance costs (in US dollars) | $ 100,000 |  |  |
2013 Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility maximum borrowing capacity (in US dollars) |  |  |  | $ 750,000,000
Borrowings under revolving credit facility (in US dollars) |  |  | 0 |
2013 Term Loan |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Term Loan (in US dollars) |  |  | $ 315,000,000 | $ 350,000,000
2016 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Expiration date of revolving credit facility |  | Aug. 03, 2021 |  |
Interest rate | 1.77% | 1.77% |  |
Debt issuance costs, capitalized (in US dollars) | $ 3,000,000 | $ 3,000,000 |  |
2016 Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility maximum borrowing capacity (in US dollars) | 900,000,000 | 900,000,000 |  |
Increase in borrowing capacity (in US dollars) | 1,300,000,000 | 1,300,000,000 |  |
Letters of credit maximum borrowing capacity (in US dollars) | 300,000,000 | $ 300,000,000 |  |
Commitment fee percentage of unused amount |  | 0.20% |  |
Borrowings under revolving credit facility (in US dollars) | 125,000,000 | $ 125,000,000 |  |
2016 Term Loan |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Term Loan (in US dollars) | $ 400,000,000 | 400,000,000 |  |
Periodic principal payment on term loan (in US dollars) |  | $ 5,000,000 |  |
Minimum [Member] | 2016 Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee percentage of unused amount |  | 0.15% |  |
Letter of credit fees | 1.00% | 1.00% |  |
Maximum [Member] | 2016 Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee percentage of unused amount |  | 0.30% |  |
Letter of credit fees | 1.75% | 1.75% |  |
Base Rate [Member] | 2016 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate |  | 0.00% |  |
Base Rate [Member] | Minimum [Member] | 2016 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate |  | 0.00% |  |
Base Rate [Member] | Maximum [Member] | 2016 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate |  | 0.75% |  |
Prime Rate [Member] | 2016 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commercial lending rate | 3.50% | 3.50% |  |
Federal Funds Rate [Member] | 2016 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate |  | 0.50% |  |
London Interbank Offered Rate (LIBOR) [Member] | 2016 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commercial lending rate | 0.52% | 0.52% |  |
Basis spread on variable rate |  | 1.00% |  |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | 2016 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate |  | 1.00% |  |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | 2016 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate |  | 1.75% |  |

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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + 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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 Reference 3: 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 carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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) -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 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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