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Other Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Other Comprehensive Income (Loss), before Tax |  |
Other Comprehensive Income (Loss), before Tax | $ 1.4 | $ 107.8
Unrealized gain on foreign currency cash flow hedges | 0.2 | 0.0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] |  |
Other Comprehensive Income (Loss), Tax | (0.5) | (40.9)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |
Other Comprehensive Income (Loss), Net of Tax | 0.9 | 66.9
Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |
Other Comprehensive Income (Loss), before Tax |  |
Other Comprehensive Income (Loss), before Tax | 1.1 | 107.6
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] |  |
Other Comprehensive Income (Loss), Tax | (0.4) | (40.8)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |
Other Comprehensive Income (Loss), Net of Tax | 0.7 | 66.8
Amortization of net actuarial loss1 |  |
Other Comprehensive Income (Loss), before Tax |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 0.1 | 0.3
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] |  |
Reclassification from AOCI, Current Period, Tax | 0.0 | (0.1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.1 | 0.2
Amortization of prior service cost1 |  |
Other Comprehensive Income (Loss), before Tax |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 1.0 | 0.7
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] |  |
Reclassification from AOCI, Current Period, Tax | (0.4) | (0.3)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.6 | 0.4
Removal of obligation relating to Union VEBA |  |
Other Comprehensive Income (Loss), before Tax |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 106.6
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] |  |
Reclassification from AOCI, Current Period, Tax |  | (40.4)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | 66.2
Reclassification of unrealized loss upon sale of available for sale securities2 |  |
Other Comprehensive Income (Loss), before Tax |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 0.1
Other Comprehensive Income (Loss), before Tax |  | 0.1
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] |  |
Reclassification from AOCI, Current Period, Tax |  | (0.1)
Other Comprehensive Income (Loss), Tax |  | (0.1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | 0.0
Other Comprehensive Income (Loss), Net of Tax |  | 0.0
Foreign currency translation gain |  |
Other Comprehensive Income (Loss), before Tax |  |
Other Comprehensive Income (Loss), before Tax |  | 0.1
Unrealized gain on foreign currency cash flow hedges | 0.2 |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] |  |
Other Comprehensive Income (Loss), Tax |  | 0.0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax | (0.1) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |
Other Comprehensive Income (Loss), Net of Tax |  | $ 0.1
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax | 0.1 |
Foreign currency translation gain | Canadian Pension Plan |  |
Other Comprehensive Income (Loss), before Tax |  |
Canadian Pension foreign currency translation changes (before tax) | 0.1 |
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] |  |
Canadian Pension foreign currency translation changes (tax) | 0.0 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] |  |
Canadian Pension foreign currency translation changes (net of tax) | $ 0.1 |

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