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Long-Term Debt (Details)
£ in Millions, AUD in Millions, $ in Millions
1 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2017
GBP (£)
Aug. 31, 2017
USD ($)
May 31, 2016
USD ($)
Nov. 30, 2014
USD ($)
Aug. 31, 2012
USD ($)
Nov. 30, 2017
AUD
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
AUD
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Long Term Debt                    
Total long-term debt                 $ 2,163.2 $ 1,877.1
Less: current portion                 (72.8) (48.3)
Net long-term debt                 2,090.4 1,828.8
Scheduled maturities of long-term debt for each of the next five years and thereafter                    
2018                 72.8  
2019                 58.8  
2020                 487.0  
2021                 36.9  
2022                 576.1  
2023 and thereafter                 931.6  
US Credit Agreement Revolving Credit Line                    
Long Term Debt                    
Total long-term debt                 172.0 240.0
Maximum credit available                 700.0  
Balance outstanding under credit agreement                 172.0  
Revolving loans solely for future U.S. acquisitions                 250.0  
Future borrowings available for foreign acquisitions                 150.0  
US Credit Agreement Revolving Credit Line | LIBOR portion                    
Long Term Debt                    
Base rate of interest on loans             LIBOR      
Line of credit basis spread on variable rate (as a percent)             2.00%      
Incremental interest rate for uncollateralized borrowings in excess of maximum limit (as a percent)             1.50%      
UK Credit Agreement Revolving Credit Line                    
Long Term Debt                    
Total long-term debt                 47.3 48.1
Maximum credit available | £ £ 150.0           £ 150.0      
Balance outstanding under credit agreement £ 35.0           £ 35.0   47.3  
UK Credit Agreement Revolving Credit Line | LIBOR portion                    
Long Term Debt                    
Base rate of interest on loans             LIBOR      
UK Credit Agreement Revolving Credit Line | Minimum | LIBOR portion                    
Long Term Debt                    
Line of credit basis spread on variable rate (as a percent)             1.35%      
UK Credit Agreement Revolving Credit Line | Maximum | LIBOR portion                    
Long Term Debt                    
Line of credit basis spread on variable rate (as a percent)             3.00%      
UK Credit Agreement Overdraft Line of Credit                    
Long Term Debt                    
Total long-term debt                   2.7
UK Credit Agreement Overdraft Line of Credit | Bank of England Base Rate                    
Long Term Debt                    
Base rate of interest on loans             Bank of England Base Rate      
Line of credit basis spread on variable rate (as a percent)             1.75%      
5.50% senior subordinated notes due 2026                    
Long Term Debt                    
Total long-term debt                 $ 494.4 $ 493.7
Interest rate (as a percent) 5.50%           5.50% 5.50% 5.50% 5.50%
Debt issued     $ 500.0              
Domestic Subsidiaries ownership guaranteeing obligations (as a percent) 100.00%           100.00% 100.00% 100.00%  
Change of control, redemption price as a percentage of principal     101.00%              
Sale of assets, redemption price as percentage of principal     100.00%              
5.50% senior subordinated notes due 2026 | Debt Redemption Prior to May 15, 2021                    
Long Term Debt                    
Percentage of principal amount at which the entity may redeem the notes     100.00%              
5.50% senior subordinated notes due 2026 | Maximum | Debt Redemption Prior to May 15, 2019                    
Long Term Debt                    
Specified equity offerings, percentage of debt which may be redeemed     40.00%              
5.375% senior subordinated Notes Due 2024                    
Long Term Debt                    
Total long-term debt                 $ 297.2 $ 296.8
Interest rate (as a percent) 5.375%           5.375% 5.375% 5.375% 5.375%
Debt issued       $ 300.0            
Domestic Subsidiaries ownership guaranteeing obligations (as a percent) 100.00%           100.00% 100.00% 100.00%  
Change of control, redemption price as a percentage of principal       101.00%            
Sale of assets, redemption price as percentage of principal       100.00%            
5.375% senior subordinated Notes Due 2024 | Debt Redemption Prior To December 1, 2019                    
Long Term Debt                    
Percentage of principal amount at which the entity may redeem the notes       100.00%            
5.75% senior subordinated notes due 2022                    
Long Term Debt                    
Total long-term debt                 $ 545.9 $ 545.1
Interest rate (as a percent) 5.75%           5.75% 5.75% 5.75% 5.75%
Debt issued         $ 550.0          
Domestic Subsidiaries ownership guaranteeing obligations (as a percent) 100.00%           100.00% 100.00% 100.00%  
Change of control, redemption price as a percentage of principal         101.00%          
Sale of assets, redemption price as percentage of principal         100.00%          
3.75% senior subordinated notes due 2020                    
Long Term Debt                    
Total long-term debt                 $ 296.5  
Interest rate (as a percent) 3.75%           3.75% 3.75% 3.75%  
Debt issued   $ 300.0                
Domestic Subsidiaries ownership guaranteeing obligations (as a percent) 100.00%           100.00% 100.00% 100.00%  
Percentage of principal amount at which the entity may redeem the notes             100.00%      
Change of control, redemption price as a percentage of principal   101.00%                
Sale of assets, redemption price as percentage of principal   100.00%                
Australia capital loan agreement, December 2017                    
Long Term Debt                    
Total long-term debt                 $ 39.0  
Debt term 5 years                  
Maximum credit available | AUD               AUD 50.0    
Call period 90 days                  
Maximum amount of debt guaranteed by the Company's U.S. parent company | AUD               50.0    
Balance outstanding under credit agreement               50.0 39.0  
Australia capital loan agreement, December 2017 | Australian BBSW 30-Day Bill Rate                    
Long Term Debt                    
Base rate of interest on loans 30-day Bill Rate                  
Line of credit basis spread on variable rate (as a percent) 3.00%                  
Australia working capital loan agreement, December 2017                    
Long Term Debt                    
Debt term 1 year                  
Maximum credit available | AUD               50.0    
Call period 90 days                  
Maximum amount of debt guaranteed by the Company's U.S. parent company | AUD               50.0    
Balance outstanding under credit agreement               AUD 0.0 0.0  
Australia working capital loan agreement, December 2017 | Australian BBSW 30-Day Bill Rate                    
Long Term Debt                    
Base rate of interest on loans 30-day Bill Rate                  
Line of credit basis spread on variable rate (as a percent) 3.00%                  
Australia working capital loan agreement                    
Long Term Debt                    
Total long-term debt                   $ 24.7
Maximum credit available | AUD           AUD 50.5        
Australia working capital loan agreement | Australian BBSW 30-Day Bill Rate                    
Long Term Debt                    
Base rate of interest on loans           30-day Bill Rate        
Line of credit basis spread on variable rate (as a percent)           2.70%        
Mortgage facilities                    
Long Term Debt                    
Total long-term debt                 235.5 199.9
Balance outstanding under credit agreement                 235.5  
Other debt                    
Long Term Debt                    
Total long-term debt                 $ 35.4 $ 26.1