Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	$ 7.0	$ 5.3	$ 4.8
Cash paid for income taxes	$ 49.8	171.4	130.1
Non-cash addition of fixed assets			$ 9.2
Non-cash charges to fixed assets associated with Korea building lease		19.4
Non-cash increase in long-term liabilities		16.7
Non-cash decrease in long-term assets		$ (2.7)