Financial Instruments - Fair Value of Derivative Financial Instruments in Consolidated Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Interest Rate Swap | Designated as Hedging Instrument | Other assets
Derivative Instruments [Abstract]
Fair value of gross derivative asset	$ 0	[1]	$ 2.5	[1]
Interest Rate Swap | Designated as Hedging Instrument | Other Noncurrent Liabilities [Member]
Derivative Instruments [Abstract]
Fair value of gross liabilities	2.1	[1]	0	[1]
Foreign exchange contracts | Not Designated as Hedging Instrument | Prepaid expenses and other
Derivative Instruments [Abstract]
Fair value of gross derivative asset	0	[2]	1.0	[2]
Foreign exchange contracts | Not Designated as Hedging Instrument | Accrued Expenses
Derivative Instruments [Abstract]
Fair value of gross liabilities	$ 0.9	[2]	$ 0.2	[2]

[1] The fair values of the 2013 Interest Rate Swap at June 30, 2014 and December 31, 2013 were measured based on the implied forward rates from the U.S. Dollar three-month LIBOR yield curve at June 30, 2014 and December 31, 2013, respectively.

[2] The fair values of the FX Contracts at June 30, 2014 and December 31, 2013 were measured based on observable market transactions of spot and forward rates at June 30, 2014 and December 31, 2013, respectively.