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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense, net | $ (25.2) | $ (22.5) | $ (49.2) | $ (44.1)
Income tax benefit | (65.4) | (61.8) | (127.1) | (117.3)
Net income | 143.2 | 115.9 | 260.6 | 219.6
Income before taxes | 208.6 | 177.7 | 387.7 | 336.9
Unfunded Employee Benefit Obligations | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax benefit | 1.2 | 1.0 | 2.3 | 2.0
Net income | (2.1) | (1.6) | (4.3) | (3.2)
Amortization of prior service costs | (1.4) | (1.4) | (2.9) | (2.8)
Amortization of actuarial losses | (1.9) | (1.2) | (3.7) | (2.4)
Income before taxes | (3.3) | (2.6) | (6.6) | (5.2)
Treasury Lock | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense, net | (1.4) | (1.4) | (2.8) | (2.8)
Income tax benefit | 0.6 | 0.6 | 1.2 | 1.1
Net income | $ (0.8) | $ (0.8) | $ (1.6) | $ (1.7)

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