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Stockholders' Deficit - Schedule of Dividends Declared (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Apr. 03, 2020
Feb. 20, 2020
Jan. 10, 2020
Oct. 08, 2019
Oct. 04, 2019
Aug. 01, 2019
Jul. 12, 2019
May 13, 2019
Apr. 05, 2019
Feb. 20, 2019
Jan. 04, 2019
Oct. 06, 2018
Oct. 05, 2018
Aug. 02, 2018
Jul. 06, 2018
May 14, 2018
Apr. 06, 2018
Feb. 14, 2018
Jan. 05, 2018
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]                                                          
Dividends declared per common share (in dollars per share)   $ 0.76   $ 0.69   $ 0.69   $ 0.69   $ 0.69   $ 0.63   $ 0.63   $ 0.63   $ 0.63                 $ 0.76 $ 2.76 $ 2.52
Dividends paid per common share (in dollars per share) $ 0.76   $ 0.69   $ 0.69   $ 0.69   $ 0.69   $ 0.63   $ 0.63   $ 0.63   $ 0.63   $ 0.97               $ 1.45 $ 2.70 $ 2.86
Payments of dividends     $ 11.7               $ 11.4               $ 17.7 $ 12.7 $ 11.8 $ 12.2 $ 12.5 $ 11.4 $ 11.4 $ 11.5 $ 24.4 $ 47.9 $ 52.0