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Long-term Debt - U.S. Bank Debt (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  | 3 Months Ended |  |  |  |  |  |  |  |
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Mar. 31, 2013 | Mar. 31, 2013 U.S. bank debt and receivables facility [Member] | Dec. 31, 2012 U.S. bank debt and receivables facility [Member] | Mar. 31, 2013 Revolving credit and term loan facilities [Member] | Mar. 31, 2013 Senior Secured Term Loan B [Member] | Mar. 31, 2012 Medium-term Notes [Member] | Mar. 31, 2013 Senior Secured Term Loan A [Member] | Mar. 31, 2013 Senior Secured Term Loan B [Member] | Mar. 31, 2013 Revolving credit facility [Member] | Dec. 31, 2012 Revolving credit facility [Member] | Mar. 31, 2013 Letters of credit [Member] | Dec. 31, 2012 Letters of credit [Member] | Mar. 31, 2013 Fair Value, Inputs, Level 2 [Member] Senior Secured Term Loan A [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Senior Secured Term Loan A [Member] | Mar. 31, 2013 Fair Value, Inputs, Level 2 [Member] Senior Secured Term Loan B [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Senior Secured Term Loan B [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  | $ 250.0 |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  | 2.00% | 2.75% | 2.00% |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 200.0 | 200.0 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Incremental debt commitments capacity |  |  |  | 300 |  |  |  |  |  |  |  |  |  |  |  |
Net leverage ratio | 2.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Facility, Required Prepay Premium |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Term Loan Facility, Required Prepay Portion Under Excess Cash Flow Sweep Provision [Line Items] |  |  |  |  |  | 5.0 |  |  |  |  |  |  |  |  |  |
Letters of Credit, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  | 75.0 |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  |  |  |  | 23.6 | 23.3 |  |  |  |
Revolving Credit Facility, Amount Outstanding |  |  |  |  |  |  |  |  | 30.0 | 0 |  |  |  |  |  |
Revolving Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  | 196.4 | 226.7 |  |  |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  | $ 156.1 | $ 230.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value, % of par value |  |  |  |  |  |  |  |  |  |  |  |  | 99.50% | 99.30% | 100.00% | 99.90%

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- Definition Incremental debt commitments capacity. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the letters of credit. + References No definition available. + Details
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- Definition The fair value of long-term debt presented as a % of par value. + References No definition available. + Details
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- Definition Net leverage ratio, as defined + References No definition available. + Details
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- Definition Term Loan Facility, Required prepay portion under excess cash flow sweep provision + References No definition available. + Details
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- Definition Term Loan Facility, Required Prepay Premium + References No definition available. + Details
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- Definition The 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 stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: 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=6451184&loc=d3e28551-108399 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=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition When presenting a range of interest rates, the lowest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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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- Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + 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(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Subparagraph b -Article 5 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + 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 Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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