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Debt Obligations - Schedule of Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 23, 2021
Mar. 31, 2021
Feb. 01, 2021
Dec. 31, 2020
Mar. 31, 2020
Debt Instrument [Line Items]          
Obligations under finance leases   $ 0.4   $ 0.8  
Total aggregate finance lease and debt payments   549.4     $ 576.6
Issuance discount, issuance premium, and deferred financing costs   (3.3)     (15.1)
Less: current portion of debt obligations   (82.8)   (433.6) (433.6)
Debt obligations   $ 463.3   $ 127.9 127.9
8.50% Senior Secured Notes, due 2026          
Debt Instrument [Line Items]          
Interest rate     100.00%    
Infrastructure | LIBOR | LIBOR plus 5.85% Note, due 2023 | DBM Global Credit Facilities          
Debt Instrument [Line Items]          
Basis spread on variable rate   5.85%      
Infrastructure | LIBOR | LIBOR plus 5.85% Note, due 2023 | Real Estate Term Advance          
Debt Instrument [Line Items]          
Outstanding debt   $ 70.6     71.6
Infrastructure | LIBOR | LIBOR plus 1.50% Line of Credit | Real Estate Term Advance          
Debt Instrument [Line Items]          
Outstanding debt   $ 38.3     38.7
Infrastructure | LIBOR | LIBOR plus 1.50% Line of Credit | Real Estate Term Advance | DBM Global Credit Facilities | Revolving Credit Facility          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.50%      
Infrastructure | LIBOR | Obligations under finance leases | Real Estate Term Advance          
Debt Instrument [Line Items]          
Outstanding debt   $ 0.1     0.2
Spectrum          
Debt Instrument [Line Items]          
Obligations under finance leases   0.3     0.6
Spectrum | 8.50% Note due 2021          
Debt Instrument [Line Items]          
Outstanding debt   $ 19.3     19.3
Interest rate   8.50%      
Spectrum | 10.50% Note due 2021          
Debt Instrument [Line Items]          
Outstanding debt   $ 32.9     32.9
Interest rate   10.50%      
Spectrum | Other, various maturity dates          
Debt Instrument [Line Items]          
Outstanding debt   $ 2.9     2.9
Non-Operating Corporate | 11.50% Senior Secured Notes, due 2021          
Debt Instrument [Line Items]          
Outstanding debt   $ 0.0     340.4
Interest rate   11.50%      
Non-Operating Corporate | 8.50% Senior Secured Notes, due 2026          
Debt Instrument [Line Items]          
Outstanding debt   $ 330.0     0.0
Interest rate   8.50% 8.50%    
Non-Operating Corporate | 7.50% Convertible Senior Notes, due 2022          
Debt Instrument [Line Items]          
Outstanding debt   $ 3.2     55.0
Interest rate   7.50% 7.50%    
Non-Operating Corporate | 7.50% Convertible Senior Notes, due 2026          
Debt Instrument [Line Items]          
Outstanding debt   $ 51.8     0.0
Interest rate   7.50%      
Non-Operating Corporate | LIBOR plus 5.75% Line of Credit          
Debt Instrument [Line Items]          
Basis spread on variable rate 6.75% 5.75%      
Outstanding debt   $ 0.0     $ 15.0
Non-Operating Corporate | LIBOR plus 5.75% Line of Credit | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate 5.75%        
Non-Operating Corporate | LIBOR plus 5.75% Line of Credit | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate 6.75%