Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	$ 11.6	$ 7.0	$ 5.3
Cash paid for income taxes	$ 40.9	$ 49.8	171.4
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)