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Long-Term Debt (Details)
£ in Millions, AUD in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2016
AUD
May 31, 2016
USD ($)
Nov. 30, 2014
USD ($)
Aug. 31, 2012
USD ($)
Dec. 31, 2016
GBP (£)
Dec. 31, 2016
AUD
Dec. 31, 2016
USD ($)
Jul. 27, 2016
USD ($)
Mar. 31, 2016
AUD
Feb. 29, 2016
AUD
Dec. 31, 2015
USD ($)
Dec. 31, 2014
Long Term Debt                        
Total long-term debt             $ 1,877.1       $ 1,275.0  
Less: current portion             (48.3)       (28.0)  
Net long-term debt             1,828.8       1,247.0  
Scheduled maturities of long-term debt for each of the next five years and thereafter                        
2017             48.3          
2018             8.5          
2019             312.9          
2020             12.9          
2021             24.4          
2022 and thereafter             1,470.1          
US Credit Agreement Revolving Credit Line                        
Long Term Debt                        
Total long-term debt             240.0       160.0  
Maximum credit available             700.0          
Balance outstanding under credit agreement             240.0          
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             48.1       70.7  
Maximum credit available | £         £ 150.0              
Balance outstanding under credit agreement         £ 41.2   50.8          
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             $ 493.7          
Interest rate (as a percent)         5.50% 5.50% 5.50%          
Debt issued   $ 500.0                    
Domestic Subsidiaries ownership guaranteeing obligations (as a percent)         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             $ 296.8       $ 296.4  
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%          
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%                  
5.375% Senior Subordinated Notes Due 2024 | Maximum | Debt Redemption Prior To December 1, 2017                        
Long Term Debt                        
Specified equity offerings, percentage of debt which may be redeemed     40.00%                  
5.75% senior subordinated notes due 2022                        
Long Term Debt                        
Total long-term debt             $ 545.1       $ 544.3  
Interest rate (as a percent)         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%          
Change of control, redemption price as a percentage of principal       101.00%                
Sale of assets, redemption price as percentage of principal       100.00%                
5.75% senior subordinated notes due 2022 | Debt Redemption Prior To October 1, 2017                        
Long Term Debt                        
Percentage of principal amount at which the entity may redeem the notes       100.00%                
Australia Working Capital Loan Agreement                        
Long Term Debt                        
Total long-term debt             $ 24.7       $ 5.5  
Increase in maximum credit available | AUD AUD 6.2                      
Maximum credit available | AUD AUD 50.5               AUD 44.3 AUD 28.0    
Base rate of interest on loans         30-day Bill Rate              
Line of credit basis spread on variable rate (as a percent)         2.35%              
Balance outstanding under credit agreement           AUD 34.3 24.7          
Mortgage facilities                        
Long Term Debt                        
Total long-term debt             199.9       165.8  
Balance outstanding under credit agreement             199.9          
Other Debt                        
Long Term Debt                        
Total long-term debt             $ 26.1       $ 32.3