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Derivative Instruments and Hedging Activities (Tables) | 12 Months Ended
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Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Impact of Derivative Instruments On 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
| 2016 |  | 2015
Treasury locks, net of tax | $ | (17.7 | ) |  | $ | (21.2 | )
| Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Year Ended December 31
| 2016 |  | 2015 |  | 2014
Amortization of treasury locks (included in interest expense, net) | $ | (5.7 | ) |  | $ | (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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 + Details
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