Financial Instruments - Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Foreign currency contracts [Member] | Other non-current assets
Derivatives, Fair Value [Line Items]
Derivative assets	$ 0.1
Foreign currency contracts [Member] | Prepayments and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	3.7	3.4
Foreign currency contracts [Member] | Other non-current liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	0.5
Foreign currency contracts [Member] | Accounts payable and accrued expenses
Derivatives, Fair Value [Line Items]
Derivative liabilities	2.4	7.4
Net investment hedge contracts [Member] | Other non-current liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities		$ 24.3