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Debt Obligations - Schedule of Long-term Debt (Details)
£ in Millions, $ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Total $ 861.4   $ 781.0
Issuance discount, net and deferred financing costs (33.2)   (37.1)
Debt obligations 828.2   743.9
Construction | Other      
Debt Instrument [Line Items]      
Long-term debt 0.3   0.0
Construction | LIBOR | LIBOR plus 5.85% Note, due 2023      
Debt Instrument [Line Items]      
Long-term debt $ 78.0   80.0
Basis spread on variable rate (as a percent) 5.85%    
Construction | LIBOR | LIBOR plus 1.50% Line of Credit      
Debt Instrument [Line Items]      
Long-term debt $ 53.4   34.0
Basis spread on variable rate (as a percent) 1.50%    
Marine Services      
Debt Instrument [Line Items]      
Obligations under capital leases $ 36.8   40.4
Marine Services | Other      
Debt Instrument [Line Items]      
Long-term debt 11.5   12.9
Marine Services | 7.49% Note, due 2020      
Debt Instrument [Line Items]      
Long-term debt $ 21.6 £ 17.0 14.0
Interest rate (as a percent) 7.49% 7.49%  
Energy      
Debt Instrument [Line Items]      
Other, various maturity dates $ 3.2   3.2
Energy | LIBOR plus 3.00% Term Loan due in 2023      
Debt Instrument [Line Items]      
Long-term debt 28.0    
Energy | 5.00% Term Loan due in 2022      
Debt Instrument [Line Items]      
Long-term debt $ 11.8   12.4
Interest rate (as a percent) 5.00% 5.00%  
Energy | 4.50% Note due in 2022      
Debt Instrument [Line Items]      
Long-term debt $ 10.8   11.3
Interest rate (as a percent) 4.50% 4.50%  
Energy | LIBOR | LIBOR plus 3.00% Term Loan due in 2023      
Debt Instrument [Line Items]      
Long-term debt $ 28.0   0.0
Basis spread on variable rate (as a percent) 3.00%    
Interest rate (as a percent) 3.00% 3.00%  
Life Sciences | Notes payable due in 2019      
Debt Instrument [Line Items]      
Long-term debt $ 0.0   1.7
Broadcasting | Other      
Debt Instrument [Line Items]      
Long-term debt 12.0   11.1
Broadcasting | Notes payable due in 2019      
Debt Instrument [Line Items]      
Long-term debt $ 54.0   35.0
Interest rate (as a percent) 8.50% 8.50%  
Non-Operating Corporate | 11.5% Senior Secured Notes, due 2021      
Debt Instrument [Line Items]      
Long-term debt $ 470.0   470.0
Interest rate (as a percent) 11.50% 11.50%  
Non-Operating Corporate | 7.5% Convertible Senior Notes, due 2022      
Debt Instrument [Line Items]      
Long-term debt $ 55.0   55.0
Interest rate (as a percent) 7.50% 7.50%  
Non-Operating Corporate | LIBOR | LIBOR plus 6.75% Line of Credit      
Debt Instrument [Line Items]      
Long-term debt $ 15.0   $ 0.0
Basis spread on variable rate (as a percent) 6.75%