Long-Lived Assets (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Total amortization expense	$ 6.4	$ 6.0	$ 13.3	$ 11.9
Estimated total amortization expense 2017	26.9		26.9
Estimated total amortization expense 2018	21.1		21.1
Estimated total amortization expense 2019	14.3		14.3
Estimated total amortization expense 2020	7.4		7.4
Estimated total amortization expense 2021	$ 3.2		$ 3.2