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Long-Term Debt (Details)
£ in Millions, AUD in Millions, $ in Millions
1 Months Ended 9 Months Ended
Jul. 31, 2016
AUD
May 31, 2016
USD ($)
Mar. 31, 2016
AUD
Nov. 30, 2014
USD ($)
Aug. 31, 2012
USD ($)
Sep. 30, 2016
GBP (£)
Sep. 30, 2016
AUD
Sep. 30, 2016
USD ($)
Jul. 27, 2016
USD ($)
Feb. 29, 2016
AUD
Dec. 31, 2015
USD ($)
Long Term Debt                      
Total long-term debt               $ 1,877.6     $ 1,275.0
Less: current portion               (44.1)     (28.0)
Net long-term debt               1,833.5     1,247.0
US Credit Agreement Revolving Credit Line                      
Long Term Debt                      
Total long-term debt               205.0     160.0
Maximum credit available               700.0      
Balance outstanding under credit agreement               205.0      
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               88.2     70.7
Maximum credit available | £           £ 150.0          
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 | 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           £ 68.0   88.2      
5.50% senior subordinated notes due 2026                      
Long Term Debt                      
Total long-term debt               $ 493.5      
Interest rate (as a percent)   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%      
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 | 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               $ 296.7     $ 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               $ 544.9     $ 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%            
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               $ 26.6     $ 5.5
Increase in maximum credit available | AUD AUD 6.2                    
Maximum credit available | AUD AUD 50.5   AUD 44.3             AUD 28.0  
Balance outstanding under credit agreement             AUD 34.7 26.6      
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               202.5     165.8
Balance outstanding under credit agreement               202.5      
Other Debt                      
Long Term Debt                      
Total long-term debt               $ 20.2     $ 32.3