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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Equity Method Investment, Summarized Financial Information [Abstract]      
Total current assets $ 1,125.0   $ 1,172.9
Total assets 11,946.9   12,873.2
Total current liabilities 467.4   426.8
Investment Owned, Balance [Abstract]      
Equity in earnings (losses) of ARO 1.9 $ (6.3)  
ARO      
Equity Method Investment, Summarized Financial Information [Abstract]      
Total current assets 582.0   585.2
Total liabilities 34.9   30.9
Maximum exposure to loss 547.1   554.3
Investment Owned, Balance [Abstract]      
50% interest in ARO net income 4.1 1.6  
Amortization of basis differences (2.2) (7.9)  
Equity in earnings (losses) of ARO 1.9 (6.3)  
ARO      
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
Equity Method Investment Summarized Fin Information Revenue 122.7 140.3  
Contract drilling (exclusive of depreciation) 86.3 108.3  
Depreciation 16.1 13.0  
General and administrative 3.0 8.3  
Operating income 17.3 10.7  
Other expense, net 4.5 6.6  
Provision for income taxes 4.5 0.9  
Equity Method Investment Summarized Fin Information Net Income Loss 8.3 $ 3.2  
Equity Method Investment, Summarized Financial Information [Abstract]      
Total current assets 364.6   358.6
Assets, Noncurrent 789.0   804.0
Total assets 1,153.6   1,162.6
Total current liabilities 52.3   70.8
Liabilities, Noncurrent 952.1   950.8
Total liabilities $ 1,004.4   $ 1,021.6