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Supplemental Information (Components of Interest Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary of components of interest expense |  |  |
Interest expense, net of capitalized interest | $ 32.1 | $ 28.1 | $ 25.2
Interest income | 1.5 | 1.1 | 1.6
Interest expense, net | $ 30.6 | $ 27.0 | $ 23.6

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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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