Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	$ 1,144.6	$ 1,152.4
Long-term Debt, Fair Value	1,182.8	1,205.4
Senior secured term loan (including current portion) [Member]
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	538.2	543.4
Long-term Debt, Fair Value	541.9	550.0
Senior Unsecured Notes Due 2017 [Member]
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	296.4	295.6
Long-term Debt, Fair Value	309.0	321.8
Senior Unsecured Notes Due 2020 [Member]
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	300.0	300.0
Long-term Debt, Fair Value	323.4	321.8
Malaysian Loan [Member]
Carrying amount and estimated fair value of long term debt
Long-term Debt, Carrying Amount	10.0	13.4
Long-term Debt, Fair Value	8.5	11.8
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Fund [Member]
Fair Value Measurements
Money Market Fund	293.3	312.2
Significant Other Observable Inputs (Level 2) [Member] | Interest rate swaps [Member]
Fair Value Measurements
Fair value liabilities measured on recurring basis	(1.4)	(4.0)
Total Carrying Amount in Balance Sheet [Member] | Interest rate swaps [Member]
Fair Value Measurements
Fair value liabilities measured on recurring basis	(1.4)	(4.0)
Total Carrying Amount in Balance Sheet [Member] | Money Market Fund [Member]
Fair Value Measurements
Money Market Fund	293.3	312.2
Assets Measured At Fair Value [Member] | Money Market Fund [Member]
Fair Value Measurements
Money Market Fund	293.3	312.2
Liabilities Measured At Fair Value [Member] | Interest rate swaps [Member]
Fair Value Measurements
Fair value liabilities measured on recurring basis	$ (1.4)	$ (4.0)