Debt - Credit Facilities - Commitments, Amounts Outstanding, and Amounts Available (Details) - USD ($)	Dec. 31, 2019	Jan. 31, 2018	Mar. 31, 2012
Line of Credit Facility [Line Items]
Total Commitments	$ 1,687,700,000	$ 1,450,000,000	$ 1,000,000,000.0
Total Outstanding	67,400,000
Total Available	1,602,400,000
Standby letters of credit issued	17,900,000
Senior Secured Domestic Revolving Credit Facility
Line of Credit Facility [Line Items]
Total Commitments	1,450,000,000.0
Total Outstanding	0
Total Available	1,432,100,000
Senior Secured International Revolving Credit Facility
Line of Credit Facility [Line Items]
Total Commitments	178,000,000.0
Total Outstanding	52,800,000
Total Available	125,200,000
Other International Facilities
Line of Credit Facility [Line Items]
Total Commitments	59,700,000
Total Outstanding	14,600,000
Total Available	$ 45,100,000