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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net income (loss) $ (52.4) $ (58.2) $ (227.5) $ (87.8)
Amount allocated to common stockholders (as percent) 100.00% 100.00% 100.00% 100.00%
Basic and diluted EPS        
Basic $ (52.4) $ (58.2) $ (227.5) $ (87.8)
Diluted $ (52.4) $ (58.2) $ (227.5) $ (87.8)
Basic (in shares) 90.1 89.5 90.1 89.4
Diluted (in shares) 90.1 89.5 90.1 89.4
Basic (in dollars per share) $ (0.58) $ (0.65) $ (2.52) $ (0.98)
Diluted (in dollars per share) $ (0.58) $ (0.65) $ (2.52) $ (0.98)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation of diluted EPS (in shares) 2.5 1.7 2.5 1.2
Convertible preferred shares [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation of diluted EPS (in shares) 6.3 6.6 6.3 6.6
Convertible senior notes [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation of diluted EPS (in shares) 4.8 0.0 4.8 0.0