Summary of Significant Accounting Policies, Foreign Currency Translation (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Foreign Currency Translation [Abstract]
Cumulative translation adjustment related to foreign currency adjustment	$ 71.6	$ 52.6	$ 47.6
Cumulative translation adjustment related to foreign currency adjustment, tax	$ 10.9	$ 10.8	$ 10.4