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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net assets associated with foreign currency derivatives | $ (4.3) |  | $ (4.3) |  | $ (19.7)
Maturity period of derivatives (in months) |  |  | 18 months |  |
Estimated amount of net gains (losses) associated with derivative instruments, net of tax, in next twelve months |  |  | $ (2.4) |  |
Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net gains (losses) on derivatives not designated as hedging instruments |  | $ (4.2) |  |  |
Designated as Hedging Instrument [Member] | Foreign Exchange [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Aggregate cash flow hedges outstanding | 204.0 |  | 204.0 |  |
Cash flow hedges outstanding for British pounds | 95.9 |  | 95.9 |  |
Cash flow hedges outstanding for euros | 30.3 |  | 30.3 |  |
Cash flow hedges outstanding for Australian dollars | 40.5 |  | 40.5 |  |
Cash flow hedges outstanding for Brazilian reals | 23.4 |  | 23.4 |  |
Cash flow hedges outstanding for other currencies | 13.9 |  | 13.9 |  |
Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net gains (losses) on derivatives not designated as hedging instruments | (0.4) |  | 0.5 | $ (13.2) |
Not Designated as Hedging Instrument [Member] | Foreign Exchange [Member] | Fair Value Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Aggregate cash flow hedges outstanding | 144.1 |  | 144.1 |  |
Cash flow hedges outstanding for British pounds | 13.1 |  | 13.1 |  |
Cash flow hedges outstanding for euros | 81.3 |  | 81.3 |  |
Cash flow hedges outstanding for Brazilian reals | 10.7 |  | 10.7 |  |
Cash flow hedges outstanding for Indonesian rupiah | 11.4 |  | 11.4 |  |
Cash flow hedges outstanding for Swiss francs | 18.2 |  | 18.2 |  |
Cash flow hedges outstanding for other currencies | $ 9.4 |  | $ 9.4 |  |

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