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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Equity Method Investment, Summarized Financial Information [Abstract]      
    Cash and cash equivalents $ 578.2   $ 608.7
    Other current assets 125.7   117.8
Total assets 2,637.7   2,609.2
Liabilities, Current 523.3   422.0
Investment Owned, Balance [Abstract]      
Equity in earnings of ARO 4.3 $ 1.9  
ARO      
Equity Method Investment, Summarized Financial Information [Abstract]      
Total assets 362.9   348.1
Total liabilities 51.0   49.1
Maximum exposure to loss 311.9   299.0
Investment Owned, Balance [Abstract]      
50% interest in ARO net income 0.7 4.1  
Amortization of basis differences 3.6 (2.2)  
Equity in earnings of ARO 4.3 1.9  
ARO      
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
Equity Method Investment Summarized Fin Information Revenue 111.3 122.7  
Contract drilling (exclusive of depreciation) 84.2 86.3  
Depreciation 16.5 16.1  
General and administrative 5.2 3.0  
Operating income 5.4 17.3  
Other expense, net 3.3 4.5  
Provision for income taxes 0.7 4.5  
Equity Method Investment Summarized Fin Information Net Income Loss 1.4 $ 8.3  
Equity Method Investment, Summarized Financial Information [Abstract]      
    Cash and cash equivalents 240.2   270.8
    Other current assets 179.5   135.0
Non-current assets 775.8   775.8
Total assets 1,195.5   1,181.6
Liabilities, Current 92.9   79.9
Liabilities, Noncurrent 957.9   956.7
Total liabilities $ 1,050.8   $ 1,036.6