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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, 2021
Jun. 30, 2020
Apr. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Equity Method Investment, Summarized Financial Information [Abstract]                
    Cash and cash equivalents $ 607.6 $ 608.8 $ 608.8   $ 607.6 $ 608.8   $ 325.8
    Other current assets 90.5 119.7 119.7   90.5 119.7   386.5
Total assets 2,595.6 2,601.7 2,601.7   2,595.6 2,601.7   12,873.2
Liabilities, Current 390.6 396.6 396.6   390.6 396.6   426.8
Investment Owned, Balance [Abstract]                
Equity in earnings (losses) of ARO 1.2 4.8   $ (5.2) 3.1   $ (11.5)  
ARO                
Equity Method Investment, Summarized Financial Information [Abstract]                
Total assets   340.7 340.7     340.7   585.2
Total liabilities   38.6 38.6     38.6   30.9
Maximum exposure to loss   302.1 302.1     302.1   554.3
Investment Owned, Balance [Abstract]                
50% interest in ARO net income 1.9 2.3   3.3 6.0   4.9  
Amortization of basis differences (0.7) 2.5   (8.5) (2.9)   (16.4)  
Equity in earnings (losses) of ARO $ 1.2 4.8   (5.2) $ 3.1   (11.5)  
ARO                
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]                
Equity Method Investment Summarized Fin Information Revenue     124.8 146.0   247.5 286.3  
Contract drilling (exclusive of depreciation)     92.7 112.5   179.0 220.8  
Depreciation     14.6 13.3   30.7 26.3  
General and administrative     4.3 7.1   7.3 15.4  
Operating income     13.2 13.1   30.5 23.8  
Other expense, net     3.1 6.7   7.6 13.3  
Provision (Benefit) for income taxes     1.9 (0.2)   6.4 0.7  
Equity Method Investment Summarized Fin Information Net Income Loss     8.2 $ 6.6   16.5 $ 9.8  
Equity Method Investment, Summarized Financial Information [Abstract]                
    Cash and cash equivalents   318.2 318.2     318.2   237.7
    Other current assets   81.7 81.7     81.7   120.9
Non-current assets   782.8 782.8     782.8   804.0
Total assets   1,182.7 1,182.7     1,182.7   1,162.6
Liabilities, Current   74.9 74.9     74.9   70.8
Liabilities, Noncurrent   950.3 950.3     950.3   950.8
Total liabilities   $ 1,025.2 $ 1,025.2     $ 1,025.2   $ 1,021.6