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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net income (loss) $ (35.1) $ (26.9) $ (175.1) $ (29.6)
Amount allocated to common stockholders (as percent) 100.00% 100.00% 100.00% 100.00%
Basic and diluted EPS        
Basic $ (35.1) $ (26.9) $ (175.1) $ (29.6)
Diluted $ (35.1) $ (26.9) $ (175.1) $ (29.6)
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) $ (0.39) $ (0.30) $ (1.94) $ (0.33)
Diluted (in dollars per share) $ (0.39) $ (0.30) $ (1.94) $ (0.33)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation of diluted EPS (in shares) 2.4 0.6 2.4 0.7
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 6.7
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