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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($)
$ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Apr. 30, 2021
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Apr. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Equity Method Investment, Summarized Financial Information [Abstract]                
    Cash and cash equivalents     $ 553.5     $ 553.5   $ 608.7
    Other current assets     159.0     159.0   117.8
Total assets     2,760.8     2,760.8   2,609.2
Liabilities, Current     547.1     547.1   422.0
Investment Owned, Balance [Abstract]                
Equity in earnings of ARO $ 1.2 $ 4.8 8.7   $ 3.1 13.0    
ARO                
Equity Method Investment, Summarized Financial Information [Abstract]                
Total assets     377.2     377.2   348.1
Total liabilities     52.9     52.9   49.1
Maximum exposure to loss     324.3     324.3   299.0
Investment Owned, Balance [Abstract]                
50% interest in ARO net income 1.9 2.3 5.0   6.0 5.7    
Amortization of basis differences (0.7) 2.5 3.7   (2.9) 7.3    
Equity in earnings of ARO $ 1.2 $ 4.8 8.7   $ 3.1 13.0    
ARO                
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]                
Equity Method Investment Summarized Fin Information Revenue     116.4 $ 124.8   227.7 $ 247.5  
Contract drilling (exclusive of depreciation)     82.1 92.7   166.3 179.0  
Depreciation     15.4 14.6   31.9 30.7  
General and administrative     3.2 4.3   8.4 7.3  
Operating income     15.7 13.2   21.1 30.5  
Other expense, net     3.3 3.1   6.6 7.6  
Provision for income taxes     2.5 1.9   3.2 6.4  
Equity Method Investment Summarized Fin Information Net Income Loss     9.9 $ 8.2   11.3 $ 16.5  
Equity Method Investment, Summarized Financial Information [Abstract]                
    Cash and cash equivalents     293.3     293.3   270.8
    Other current assets     106.3     106.3   135.0
Non-current assets     777.5     777.5   775.8
Total assets     1,177.1     1,177.1   1,181.6
Liabilities, Current     63.7     63.7   79.9
Liabilities, Noncurrent     958.7     958.7   956.7
Total liabilities     $ 1,022.4     $ 1,022.4   $ 1,036.6