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Debt - URS Senior Notes (Details) - USD ($)
$ in Millions
Oct. 24, 2014
Jun. 30, 2019
Sep. 30, 2018
Apr. 03, 2017
Feb. 21, 2017
Sep. 29, 2016
Oct. 17, 2014
Debt              
Debt   $ 3,852.5 $ 3,673.5        
Term loan A              
Debt              
Amount of debt redeemed         $ 600.0    
Borrowing capacity       $ 185.0   $ 185.0  
URS Senior Notes              
Debt              
Debt   248.0 $ 247.9       $ 1,000.0
Redemption price equal to principal using proceeds from equity offerings (in percent) 101.00%            
Amount of debt redeemed $ 572.3            
URS Senior Notes | 2017 URS Senior Notes              
Debt              
Interest rate (as a percent)             3.85%
Amount of debt redeemed       $ 179.2      
URS Senior Notes | 2022 URS Senior Notes              
Debt              
Interest rate (as a percent)             5.00%
Fair value of debt instrument   $ 253.5