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Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Before-Tax Amount |  |  |
Other Comprehensive Income (Loss), before Tax | $ 103.6 | $ (120.6) | $ 8.1
Income Tax (Expense) Benefit |  |  |
Other Comprehensive Income (Loss), Tax | (39.2) | 45.2 | (2.8)
Net-of-Tax Amount |  |  |
Other comprehensive income (loss), net of tax | 64.4 | (75.4) | 5.3
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Before-Tax Amount |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (6.1) | (129.5) | 2.2
Other Comprehensive Income (Loss), before Tax | 104.6 | (120.7) | 7.9
Income Tax (Expense) Benefit |  |  |
Other Comprehensive Income (Loss) before Reclassifications, Tax | 2.3 | 48.3 | (0.7)
Other Comprehensive Income (Loss), Tax | (39.5) | 45.1 | (2.8)
Net-of-Tax Amount |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (3.8) | (81.2) | 1.5
Other comprehensive income (loss), net of tax | 65.1 | (75.6) | 5.1
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |
Before-Tax Amount |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (12.9) | (39.0) | 87.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 1.1 | (1.8) | 1.5
Income Tax (Expense) Benefit |  |  |
Other Comprehensive Income (Loss) before Reclassifications, Tax | 4.9 | 14.5 | (32.5)
Reclassification from AOCI, Current Period, Tax | (0.4) | 0.7 | (0.5)
Net-of-Tax Amount |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (8.0) | (24.5) | 54.5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.7 | (1.1) | 1.0
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |  |
Before-Tax Amount |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 6.8 | (90.5) | (84.8)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 3.0 | 10.6 | 4.2
Income Tax (Expense) Benefit |  |  |
Other Comprehensive Income (Loss) before Reclassifications, Tax | (2.6) | 33.8 | 31.8
Reclassification from AOCI, Current Period, Tax | (1.2) | (3.9) | (1.6)
Net-of-Tax Amount |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 4.2 | (56.7) | (53.0)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1.8 | 6.7 | 2.6
Accumulated Defined Benefit Plans Adjustment, Removal Of Obligation Attributable to Parent [Member] |  |  |
Before-Tax Amount |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 106.6 |  |
Income Tax (Expense) Benefit |  |  |
Reclassification from AOCI, Current Period, Tax | (40.2) |  |
Net-of-Tax Amount |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 66.4 |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |
Before-Tax Amount |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (0.1) | (0.2) | 1.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (0.4) | (0.1) | (1.0)
Other Comprehensive Income (Loss), before Tax | (0.5) | (0.3) | 0.0
Income Tax (Expense) Benefit |  |  |
Other Comprehensive Income (Loss) before Reclassifications, Tax | 0.0 | 0.1 | (0.3)
Reclassification from AOCI, Current Period, Tax | 0.2 | 0.0 | 0.3
Other Comprehensive Income (Loss), Tax | 0.2 | 0.1 | 0.0
Net-of-Tax Amount |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (0.1) | (0.1) | 0.7
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (0.2) | (0.1) | (0.7)
Other comprehensive income (loss), net of tax | (0.3) | (0.2) | 0.0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |
Before-Tax Amount |  |  |
Other Comprehensive Income (Loss), before Tax | (0.3) |  |
Income Tax (Expense) Benefit |  |  |
Other Comprehensive Income (Loss), Tax | 0.1 |  |
Net-of-Tax Amount |  |  |
Other comprehensive income (loss), net of tax | (0.2) |  |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |
Before-Tax Amount |  |  |
Other Comprehensive Income (Loss), before Tax | (0.2) | 0.4 | 0.2
Income Tax (Expense) Benefit |  |  |
Other Comprehensive Income (Loss), Tax | 0.0 | 0.0 | 0.0
Net-of-Tax Amount |  |  |
Other comprehensive income (loss), net of tax | $ (0.2) | $ 0.4 | $ 0.2

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