Debt - Senior Credit Facilities (Details)	1 Months Ended		3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2018	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 1,215,900,000		$ 1,215,900,000
Senior Notes [Member] | Senior Credit Facilities
Debt Instrument [Line Items]
Leverage ratio covenant	3.75		3.75
Leverage ratio covenant period			12 months
EBITDA ratio covenant	3.00		3.00
Senior Notes [Member] | Senior Credit Facilities | Minimum
Debt Instrument [Line Items]
Debt covenant, consolidated unrestricted cash	$ 5,000,000.0		$ 5,000,000.0
Senior Notes [Member] | Senior Credit Facilities | Maximum
Debt Instrument [Line Items]
Debt covenant, consolidated unrestricted cash	250,000,000.0		250,000,000.0
Senior Notes [Member] | Term Loan Facility
Debt Instrument [Line Items]
Debt term		5 years
Maximum borrowing capacity					$ 200,000,000.0
Long-term Debt, Gross	131,300,000		131,300,000	$ 135,000,000.0
Senior Notes [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt term		5 years
Maximum borrowing capacity					$ 600,000,000.0
Line of credit increase limit	300,000,000.0		300,000,000.0
Long-term Debt, Gross	284,600,000		284,600,000	$ 134,600,000
Proceeds from lines of credit	150,000,000.0
Line of credit facility, remaining borrowing capacity	$ 315,400,000		$ 315,400,000