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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Share Repurchase Program | Share repurchase activity follows (in millions, except share and per share amounts).
| Shares |  | Weighted Average Price Per Share |  | Total
2015 | 2,326,493 |  |  | $ | 66.50 |  |  | $ | 154.7 |
2016 | 1,987,187 |  |  | $ | 50.49 |  |  | $ | 100.3 |
Components of Changes in Accumulated Other Comprehensive Income (AOCI) | Changes in AOCI, net of taxes, by component follows (dollars in millions). Amounts in parentheses indicate losses.
|  | Unrealized Loss On Treasury Locks, Net |  | Unrealized Loss on Foreign Exchange Contracts |  | Unfunded Employee Benefit Obligations |  | Total
Balance at December 31, 2015 |  | $ | (21.2 | ) |  | $ | (0.4 | ) |  | $ | (103.3 | ) |  | $ | (124.9 | )
Other comprehensive income (loss) before reclassifications, net of tax |  | — |  |  | — |  |  | (24.9 | ) |  | (24.9 | )
Amounts reclassified from AOCI, net of tax |  | 3.5 |  |  | — |  |  | 6.7 |  |  | 10.2 |
Net current-period other comprehensive income (loss) |  | 3.5 |  |  | — |  |  | (18.2 | ) |  | (14.7 | )
Balance at December 31, 2016 |  | $ | (17.7 | ) |  | $ | (0.4 | ) |  | $ | (121.5 | ) |  | $ | (139.6 | )
Reclassifications Out of Accumulated Other Comprehensive Income (AOCI) | The following table presents information about reclassifications out of AOCI (dollars in millions). Amounts in parentheses indicate expenses in the Consolidated Statements of Income.
|  | Amounts Reclassified from AOCI Year Ended December 31 |  |
Details about AOCI Components |  | 2016 |  | 2015 |  | Affected Line Item in the Statement Where Net Income is Presented
Foreign currency translation adjustments |  | $ | — |  |  | $ | (4.2 | ) |  | Other expense, net
|  | — |  |  | — |  |  | Tax benefit
|  | $ | — |  |  | $ | (4.2 | ) |  | Net of tax
Unrealized loss on treasury locks, net |  | $ | (5.7 | ) |  | $ | (5.7 | ) |  | See (a) below
|  | 2.2 |  |  | 2.2 |  |  | Tax benefit
|  | $ | (3.5 | ) |  | $ | (3.5 | ) |  | Net of tax
Unfunded employee benefit obligations |  |  |  |  |  |
Amortization of prior service costs |  | $ | (5.5 | ) |  | $ | (5.6 | ) |  | See (b) below
Amortization of actuarial gains / (losses) |  | (5.4 | ) |  | (8.8 | ) |  | See (b) below
|  | (10.9 | ) |  | (14.4 | ) |  | Total before tax
|  | 4.2 |  |  | 5.6 |  |  | Tax benefit
|  | $ | (6.7 | ) |  | $ | (8.8 | ) |  | Net of tax
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(a) | This AOCI component is included in interest expense, net. Amount relates to the amortization of the effective portion of treasury lock derivative instruments recorded in AOCI. The net amount of settlement gains or losses on derivative instruments included in AOCI to be amortized over the next 12 months is a net loss of $5.7 million ($3.5 million after-tax). For a discussion of treasury lock derivative instrument activity, see Note 13, Derivative Instruments and Hedging Activities, for additional information.
(b) | These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 10, Employee Benefit Plans and Other Postretirement Benefits, for additional information.

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- Definition The entire disclosure for any adjustments made during the period to avoid double counting in comprehensive income items displayed as part of net income that also had been displayed as part of other comprehensive income in that period or earlier periods. These adjustments include reclassifications to net income of items in accumulated comprehensive income, such as deferred gains or losses on qualifying hedges when hedged item reported in net income, holding gains or losses on available-for-sale securities transferred into trading category, unrealized holding gains or losses on debt securities transferred from held-to-maturity category into available-for-sale category and accumulated translation adjustment attributable to foreign subsidiary or investment in foreign entity upon sale or liquidation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e716-108580 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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