Derivatives Forward Contracts (Details) In Millions, unless otherwise specified			3 Months Ended
Mar. 31, 2015 USD ($)	Mar. 31, 2015 JPY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 JPY (¥)	Mar. 31, 2015 Forward Contracts USD ($)	Mar. 31, 2014 Forward Contracts USD ($)	Mar. 31, 2015 Forward Contracts SEK	Dec. 31, 2014 Forward Contracts USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 1,000.0invest_DerivativeNotionalAmount	¥ 117,800.0invest_DerivativeNotionalAmount	$ 1,100.0invest_DerivativeNotionalAmount	¥ 134,200.0invest_DerivativeNotionalAmount	$ 56.5		489.3	$ 33.1
Realized and unrealized gains (losses)					0	(0.1)
Carrying Value					$ 0			$ 0

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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