Summary of Significant Accounting Policies, Derivative Instruments, Foreign Exchange Contracts (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014 Foreign Exchange Contract [Member] Japan, Yen JPY (¥)	Dec. 31, 2013 Foreign Exchange Contract [Member] Japan, Yen JPY (¥)	Dec. 31, 2014 Foreign Exchange Contract [Member] United Kingdom, Pounds GBP (£)	Dec. 31, 2013 Foreign Exchange Contract [Member] United Kingdom, Pounds GBP (£)	Dec. 31, 2014 Foreign Exchange Contract [Member] Euro Member Countries, Euro EUR (€)	Dec. 31, 2013 Foreign Exchange Contract [Member] Euro Member Countries, Euro EUR (€)	Dec. 31, 2014 Foreign Exchange Contract [Member] Australia, Dollars AUD	Dec. 31, 2013 Foreign Exchange Contract [Member] Australia, Dollars AUD	Dec. 31, 2014 Foreign Exchange Contract [Member] Malaysia, Ringgits MYR	Dec. 31, 2013 Foreign Exchange Contract [Member] Malaysia, Ringgits MYR
Derivative [Line Items]
Derivative, Maturity Date	Nov. 11, 2016
Foreign exchange contract outstanding		¥ 0	¥ 10.1	£ 0.3	£ 0.2	€ 1.4	€ 13.3	0.8	0	0.5	0