Long-Lived Assets (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Total amortization expense	$ 6.7	$ 6.3	$ 20.0	$ 18.2
Estimated total amortization expense 2017	27.0		27.0
Estimated total amortization expense 2018	23.2		23.2
Estimated total amortization expense 2019	16.1		16.1
Estimated total amortization expense 2020	8.3		8.3
Estimated total amortization expense 2021	$ 3.8		$ 3.8