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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income | The following tables display the components of AOCI as of and for the years ended December 31, 2017 and 2016 (in millions):
|  | Cumulative Translation Adjustment |  |  | Pension and Postretirement Costs |  |  | Derivative Financial Instruments |  |  | AOCI |
Balance at December 31, 2015 |  | $ | (411.7 | ) |  | $ | (422.3 | ) |  | $ | 0.2 |  |  | $ | (833.8 | )
Other comprehensive (loss) income before reclassifications |  |  | (198.0 | ) |  |  | 10.0 |  |  |  | (48.0 | ) |  |  | (236.0 | )
Amounts reclassified to earnings |  |  | 1.8 |  |  |  | 12.3 |  |  |  | 10.9 |  |  |  | 25.0 |
Net current period other comprehensive income (loss) |  |  | (196.2 | ) |  |  | 22.3 |  |  |  | (37.1 | ) |  |  | (211.0 | )
Balance at December 31, 2016 |  | $ | (607.9 | ) |  | $ | (400.0 | ) |  | $ | (36.9 | ) |  | $ | (1,044.8 | )
Other comprehensive (loss) income before reclassifications |  |  | 201.7 |  |  |  | 6.6 |  |  |  | (27.8 | ) |  |  | 180.5 |
Amounts reclassified to earnings |  |  | 87.4 |  |  |  | 7.9 |  |  |  | 5.9 |  |  |  | 101.2 |
Net current period other comprehensive income (loss) |  |  | 289.1 |  |  |  | 14.5 |  |  |  | (21.9 | ) |  |  | 281.7 |
Balance at December 31, 2017 |  | $ | (318.8 | ) |  | $ | (385.5 | ) |  | $ | (58.8 | ) |  | $ | (763.1 | )
Schedule of Income Tax (Provision) Benefit Allocated to Components of OCI | The income tax provision (benefit) allocated to the components of OCI are as follows (in millions):
|  | 2017 |  |  | 2016 |  |  | 2015 |
Foreign currency translation adjustments |  | $ | 0.5 |  |  | $ | — |  |  | $ | 10.3 |
Unrecognized pension and postretirement costs |  |  | 12.3 |  |  |  | 19.6 |  |  |  | 41.1 |
Derivative hedging (loss) gain |  |  | (8.7 | ) |  |  | (20.7 | ) |  |  | 0.6 |
Income tax provision (benefit) related to OCI |  | $ | 4.1 |  |  | $ | (1.1 | ) |  | $ | 52.0 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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