Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Narrative (Details)

v3.10.0.1
STOCK-BASED COMPENSATION - Narrative (Details)
$ in Millions
1 Months Ended 12 Months Ended
May 31, 2013
shares
Dec. 31, 2018
USD ($)
plan
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of share-based award plans | plan   1    
Increase in reserve under share-based award plan, number of shares (in shares) | shares 11,000,000      
Total income tax benefit recognized for stock-based compensation expense   $ 9.7 $ 13.7 $ 13.3
Cash provided by operating activities   672.2 816.0 823.0
Excess tax benefits from stock-based compensation plans, operating activities   0.0 0.0 (35.9)
Excess tax benefits from stock-based compensation plans, financing activities   $ 0.0 0.0 35.9
Stock options vesting percentage for each year of completed service   33.00%    
Stock options expiration periods   10 years    
Minimum percentage of target to which shares may be issued   0.00%    
Maximum percentage of target to which shares may be issued   200.00%    
Percentage of target that shares may be issued   100.00%    
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment award options nonvested number of shares | shares   283,003    
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment award options nonvested number of shares | shares   566,006    
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total intrinsic value of stock options exercised   $ 13.3 31.4 64.8
Total unrecognized compensation cost   $ 8.2    
Total unrecognized compensation cost, weighted-average period of recognition   1 year 7 months    
Stock Options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock awards vesting periods (up to)   3 years    
Nonvested Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost   $ 51.6    
Total unrecognized compensation cost, weighted-average period of recognition   2 years 1 month    
Total weighted-average fair value of nonvested stock vested, based on the vesting date   $ 50.2 79.4 71.7
Total weighted-average fair value of nonvested stock vested, based on the grant date   $ 40.4 45.0 38.8
Nonvested Stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock awards vesting periods (up to)   1 year    
Nonvested Stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock awards vesting periods (up to)   3 years    
Accounting Standards Update 2016-09        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash provided by operating activities   $ 7.5 $ 26.7  
Excess tax benefits from stock-based compensation plans, operating activities       35.9
Excess tax benefits from stock-based compensation plans, financing activities       $ 35.9