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Derivative Instruments and Hedging Activities (Narrative) (Details) € in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) country | Dec. 31, 2016 USD ($) | Jan. 31, 2018 USD ($) | Jan. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 EUR (€)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Number of countries where products sold, countries (over 150) | country | 150 |  |  |  |  |  |
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate, percent | 0.33% |  |  |  |  |  |
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative, notional amount | $ 148,000,000 |  |  |  | $ 96,800,000 |  |
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Foreign Exchange Contract [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative, notional amount | 384,500,000 |  |  |  | 374,200,000 |  | € 312.0
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Cross Currency Interest Rate Contract, Payment [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative, notional amount | 302,800,000 |  |  | € 245.7 |  |  |
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Cross Currency Interest Rate Contract, Receipt [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  |  | $ 300,000,000 |  |  |  |
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | $ 300,000,000.0 |
Deferred gain on hedge termination |  | $ 7,300,000 |  |  |  |  |
Derivative, variable interest rate |  |  |  |  |  | 4.14% | 4.14%
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Derivative, notional amount | $ 1,404,400,000 |  |  |  | $ 1,701,400,000 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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