Fair Value of Financial Instruments, Balance Sheet Classification (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Assets	$ 33.8	$ 36.7
Liabilities	12.8	17.7
Derivatives Designated as Hedges [Member]
Derivatives, Fair Value [Line Items]
Assets	32.4	31.1
Liabilities	9.1	12.1
Derivatives Designated as Hedges [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	29.2	28.3
Derivatives Designated as Hedges [Member] | Non-Current Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	3.2	2.8
Derivatives Designated as Hedges [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liabilities	8.0	10.4
Derivatives Designated as Hedges [Member] | Non-Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liabilities	1.1	1.7
Derivatives not Designated as Hedges [Member]
Derivatives, Fair Value [Line Items]
Assets	1.4	5.6
Liabilities	3.7	5.6
Derivatives not Designated as Hedges [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	1.4	5.6
Derivatives not Designated as Hedges [Member] | Non-Current Assets [Member]
Derivatives, Fair Value [Line Items]
Assets	0	0
Derivatives not Designated as Hedges [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liabilities	3.7	5.6
Derivatives not Designated as Hedges [Member] | Non-Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liabilities	$ 0	$ 0