Long-term Obligations - Revolving Credit Facility (Details) $ in Millions	1 Months Ended
	Oct. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Proceeds from lines of credit	$ 300.0
Line of credit facility additional borrowing capacity	300.0
Line of Credit
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity	$ 500.0
Debt covenant, consolidated leverage ratio	3.00
Debt covenant, minimum consolidated EBITDA	$ 200.0
Base Rate | Minimum | Line of Credit
Line of Credit Facility [Line Items]
Interest rate, stated percentage	0.75%
Base Rate | Maximum | Line of Credit
Line of Credit Facility [Line Items]
Interest rate, stated percentage	1.50%
Eurodollar | Minimum | Line of Credit
Line of Credit Facility [Line Items]
Interest rate, stated percentage	1.75%
Eurodollar | Maximum | Line of Credit
Line of Credit Facility [Line Items]
Interest rate, stated percentage	2.50%