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THE COMPANY AND BASIS OF PREPARATION. (Narrative) (Details) - USD ($)
$ in Millions
 9 Months Ended
Jan. 01, 2018
Dec. 31, 2017
Sep. 30, 2018
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect adjustment upon adoption of new accounting guidance [1]   $ 14.5    
Available-for-sale investments   597.1    
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accounting guidance $ 2.3 0.0    
Additional income tax charge related to enactment of U.S. tax reform     $ 20.8  
Comptroller Of Maryland [Member] | State and local jurisdiction [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Nonrecurring income tax charge due to Maryland state tax legislation     $ 7.9  
ASU 2016-01, Adjustment for fair value for previous cost method investments [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Increase in investment carrying value 19.5      
Increase in deferred taxes 5.0      
ASU 2016-02 - Leases [Member] | Forecast [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating Lease, Right-of-Use Asset       $ 115.0
Operating Lease, Liability       $ 140.0
Accumulated other comprehensive income (loss) [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect adjustment upon adoption of new accounting guidance [1]   (7.9)    
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accounting guidance   (2.3)    
Accumulated other comprehensive income (loss) [Member] | ASU 2016-01, Available for sale securities, Unrealized gain reclassification [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect adjustment upon adoption of new accounting guidance (7.9)      
Retained earnings [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect adjustment upon adoption of new accounting guidance [1]   22.4    
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accounting guidance   $ 2.3    
Retained earnings [Member] | ASU 2016-01, Available for sale securities, Unrealized gain reclassification [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect adjustment upon adoption of new accounting guidance 7.9      
Retained earnings [Member] | ASU 2016-01, Adjustment for fair value for previous cost method investments [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect adjustment upon adoption of new accounting guidance $ 14.5      
[1] Includes the reclassification of $1.7 million of stranded income taxes on available-for-sale investments resulting from U.S. tax law changes enacted on December 22, 2017, from accumulated other comprehensive income to retained earnings.