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Accounts receivable and allowance for doubtful accounts (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Accounting Policies [Abstract] |  |
Balance of receivables past due 90 days or more | $ 30.9 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue | $ 36.4 us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Allowance for doubtful accounts | $ 9.5 us-gaap_AllowanceForDoubtfulAccountsReceivable | $ 10.1 us-gaap_AllowanceForDoubtfulAccountsReceivable

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- Details
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 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 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant