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Derivative Instruments and Hedging Activities (Notional Values and After-Tax Impact of Changes in Fair Value) (Details) - Designated as Hedging Instrument - Net Investment Hedging - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Jan. 31, 2018
Cross currency swap contract |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, notional amount | $ 300.0 |  | $ 300.0 |  | $ 300.0 | $ 300.0
Gain (loss) on derivative used in net investment hedge, net of tax | 12.0 | $ 0.1 | 16.8 | $ 11.7 |  |
Foreign currency denominated debt |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain (loss) on derivative used in net investment hedge, net of tax | $ 0.5 | $ 1.9 | $ 2.5 | $ 12.8 |  |

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