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Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2013 | Dec. 31, 2012
Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Foreign Currency Translation Adjustment, Net of Tax | $ (14.4) |  | $ (14.4) |  | $ (14.7) | $ (7.6)
Pension and Other Postretirement Benefit Plans, Net of Tax | (95.0) |  | (95.0) |  | (96.0) | (99.0)
Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | (0.4) |  | (0.4) |  | (0.3) | (0.3)
Available-for-sale Securities Adjustment, Net of Tax | 2.0 |  | 2.0 |  | 2.2 | 1.0
Other, Net of Tax | (2.0) |  | (2.0) |  | (2.0) | (2.0)
Accumulated comprehensive loss | (109.8) |  | (109.8) |  | (110.8) | (107.9)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) | 0.1 | 0.1 | 0.2 | 0.2 |  |
Defined Benefit Plan, Amortization of Gains (Losses) | 1.8 | 1.7 | 5.5 | 5.0 |  |
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Transition Asset (Obligation), Recognized in Net Periodic Benefit Cost, before Tax | (0.1) |  | (0.2) |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost | 1.8 | 2.1 | 5.5 | 6.2 |  |
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Transition Asset (Obligation), Recognized in Net Periodic Benefit Cost, Tax | 0.5 |  | 1.5 |  |  |
Foreign currency translation adjustments | 0.3 | 2.9 | (6.8) | 1.7 |  |
Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax | 2.3 |  | 8.0 |  |  |
Unrealized loss on derivative instrument | (0.1) | (0.5) | (0.1) | (0.7) |  |
Unrealized gain (loss) on marketable securities, net of reversals | (0.2) | 0.5 | 1.0 | 0.7 |  |
Other Comprehensive Income, Other, Net of Tax | 0 |  | 0 |  |  |
Other comprehensive income | 2.3 |  | 2.1 |  |  |
Pension and Other Postretirement Benefit Plans, Net Prior Service Costs Arising During Period, Net of Tax | (1.3) |  | (4.0) |  |  |
Other comprehensive income (loss), net of tax | 1.0 | 3.6 | (1.9) | 4.4 |  |
Defined benefit pension plans | 1.0 | 0.7 | 4.0 | 2.7 |  |
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax | $ 1.3 |  | $ 4.0 |  |  |

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