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Derivative Instruments and Hedging Activities (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract] |
Impact of Derivative Instruments on Consolidated Statements of Income and Accumulated OCI | The impact of derivative instruments on the consolidated statements of income and accumulated OCI was as follows (dollars in millions):
|  | Net Loss Recognized in Accumulated OCI (Effective Portion) December 31, |
|  | 2018 |  |  | 2017 |
Treasury locks, net of tax |  | $ | (10.2 | ) |  | $ | (14.2 | )
|  | Loss Reclassified from Accumulated OCI into Income (Effective Portion) Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Amortization of treasury locks (included in interest expense, net and other) |  | $ | (5.3 | ) |  | $ | (5.7 | ) |  | $ | (5.7 | )

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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