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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net assets associated with foreign currency derivatives | $ (8.5) |  | $ (8.5) |  | $ (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 |  |  | $ (4.6) |  |
Not Designated [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net gains (losses) on derivatives not designated as hedging instruments | (3.5) | $ 4.5 | 0.9 | $ (9.0) |
Foreign Exchange [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Aggregate cash flow hedges outstanding | 230.3 |  | 230.3 |  |
Cash flow hedges outstanding for British pounds | 107.6 |  | 107.6 |  |
Cash flow hedges outstanding for Brazilian reals | 28.3 |  | 28.3 |  |
Cash flow hedges outstanding for euros | 33.8 |  | 33.8 |  |
Cash flow hedges outstanding for Australian dollars | 43.6 |  | 43.6 |  |
Cash flow hedges outstanding for other currencies | 17.0 |  | 17.0 |  |
Foreign Exchange [Member] | Not Designated [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Aggregate cash flow hedges outstanding | 145.2 |  | 145.2 |  |
Cash flow hedges outstanding for British pounds | 16.9 |  | 16.9 |  |
Cash flow hedges outstanding for Brazilian reals | 9.9 |  | 9.9 |  |
Cash flow hedges outstanding for euros | 78.2 |  | 78.2 |  |
Cash flow hedges outstanding for Indonesian rupiah | 12.5 |  | 12.5 |  |
Cash flow hedges outstanding for Swiss francs | 16.0 |  | 16.0 |  |
Cash flow hedges outstanding for other currencies | $ 11.7 |  | $ 11.7 |  |

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