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Business Combinations (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Dec. 31, 2014
Business Combination, Separately Recognized Transactions [Line Items]        
Goodwill $ 996.4 $ 954.9 $ 1,286.5 $ 1,328.7
Herndon        
Business Combination, Separately Recognized Transactions [Line Items]        
Goodwill 50.8      
Identified intangibles 68.9      
Pro forma        
Unaudited pro forma revenues 1,544.3 1,699.8    
Unaudited pro forma net earnings (loss) $ 51.7 $ (376.7)    
Unaudited pro forma diluted net earnings (loss) per share $ 0.99 $ (7.21)    
Wildcat Wireline LLC        
Business Combination, Separately Recognized Transactions [Line Items]        
Accounts receivable-trade $ 12.3      
Inventories 103.7      
Other current and non-current assets 3.7      
Property and equipment 2.1      
Goodwill 50.8      
Identified intangibles 68.9      
Accounts payable (9.7)      
Other current and non-current liabilities (11.0)      
Total consideration paid $ 220.8