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Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2005	Jun. 30, 2013
Derivative, Notional Amount	$ 776.7invest_DerivativeNotionalAmount	$ 1,510.0invest_DerivativeNotionalAmount
Accumulated other comprehensive income (loss), derivatives qualifying as hedges, net of tax	(714.3)	(166.7)		(521.0)
Currency derivatives expected to be reclassified into earnings over the next twelve months	(1.9)
Approximate maximum term of currency derivatives, in months	12 months
Repayments of Long-term Debt	508.0us-gaap_RepaymentsOfLongTermDebt	1,265.0us-gaap_RepaymentsOfLongTermDebt	418.9us-gaap_RepaymentsOfLongTermDebt
Deferred losses remaining in AOCI related to the interest rate locks	4.9	2.7
Amount expected to be reclassified into interest expense over the next twelve months	0.5
Senior Notes Due In 2015 [Member]
Debt instrument, face amount					300
Designated as Hedging Instrument [Member]
Accumulated other comprehensive income (loss), derivatives qualifying as hedges, net of tax	(1.9)	(3.1)
Senior Notes Issued in 2013 [Member]
Debt instrument, face amount						$ 1,550