Income Taxes (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) rig	Dec. 31, 2019 USD ($)
Income Tax Contingency [Line Items]
Reserves for uncertain tax positions net	$ 147.3	$ 159.7
Related tax benefits	$ 0.4	$ 0.4
Operational period	12 months
Income tax benefit from CARES Act	$ 42.6
Income tax receivable	151.4
Non-cash deferred tax expense	107.6
Non-US reserve release following statute limitation	4.6
Non-cash deferred tax benefit from impairment charges	$ 95.6
Number of impaired rigs | rig	2
Minimum
Income Tax Contingency [Line Items]
Approximate audit claims assessed	$ 80.0
Maximum
Income Tax Contingency [Line Items]
Approximate audit claims assessed	100.0
Non-US
Income Tax Contingency [Line Items]
Reserve increase (decrease)	(22.2)
US
Income Tax Contingency [Line Items]
Reserve increase (decrease)	$ 11.8