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Long-Term Debt (Details)
£ in Millions, AUD in Millions, $ in Millions
1 Months Ended
May. 01, 2015
USD ($)
Mar. 31, 2016
GBP (£)
Apr. 30, 2015
GBP (£)
Nov. 30, 2014
USD ($)
Aug. 31, 2012
USD ($)
Mar. 31, 2016
AUD
Mar. 31, 2016
USD ($)
Feb. 29, 2016
AUD
Feb. 29, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2015
GBP (£)
Long Term Debt                      
Total long-term debt             $ 1,384.6     $ 1,275.0  
Less: current portion             (54.5)     (28.0)  
Net long-term debt             1,330.1     1,247.0  
US Credit Agreement Revolving Credit Line                      
Long Term Debt                      
Total long-term debt             237.0     160.0  
Initial borrowing capacity $ 450.0                    
Maximum credit available 700.0                    
Balance outstanding under credit agreement             237.0        
Revolving loans solely for future U.S. acquisitions $ 250.0                    
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             53.1     70.7  
Maximum credit available | £     £ 150.0               £ 100.0
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             1.4        
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%                
U.K. Credit Agreement Revolving Credit Line and Overdraft Line Of Credit                      
Long Term Debt                      
Balance outstanding under credit agreement   £ 38.0         54.5        
5.375% Senior Subordinated Notes Due 2024                      
Long Term Debt                      
Total long-term debt             $ 296.5     $ 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 | 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             $ 544.5     $ 544.3  
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%        
Change of control, redemption price as a percentage of principal         101.00%            
Sale of assets, redemption price as percentage of principal         100.00%            
Australia Working Capital Loan Agreement                      
Long Term Debt                      
Total long-term debt             $ 29.5     $ 5.5  
Maximum credit available           AUD 44.3 33.9 AUD 28.0 $ 21.4    
Balance outstanding under credit agreement           AUD 38.5 29.5        
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)   2.35%                  
Mortgage facilities                      
Long Term Debt                      
Total long-term debt             187.0     165.8  
Balance outstanding under credit agreement             187.0        
Other Debt Securities                      
Long Term Debt                      
Total long-term debt             $ 35.6     $ 32.3