Contractual Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Details) $ in Millions	1 Months Ended			3 Months Ended
	Dec. 31, 2019	Mar. 31, 2015 term	Mar. 31, 2014 term	Sep. 30, 2020 USD ($)
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Future capital commitment				$ 3.1
IT Services Agreement
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
IT service agreement extension term		2 years
Number of renewal terms option one | term		1
Renewal term option one (in months)		12 months
Remaining commitment amount				235.7
IBM Private Cloud Agreement
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Remaining commitment amount				226.5
Agreement term	10 years 3 months
Assets held-for-sale				18.0
EU IT Services Agreement
Contractual Commitments Contingencies And Off- Balance Sheet Arrangements [Line Items]
Number of renewal terms option one | term			1
Renewal term option one (in months)			12 months
Remaining commitment amount				$ 29.0
Number of renewal terms option two | term			1
Renewal term option two (in months)			24 months