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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Reclassification Adjustments) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Reclassification adjustment out of accumulated other comprehensive income      
Non-operating income $ (202.8) $ (16.1)  
Provision for income taxes 181.3 144.4  
Reclassification out of accumulated other comprehensive income [Member] | Net unrealized holding gains or losses [Member]      
Reclassification adjustment out of accumulated other comprehensive income      
Non-operating income 0.0 0.0  
Reclassification out of accumulated other comprehensive income [Member] | Currency translation adjustments [Member]      
Reclassification adjustment out of accumulated other comprehensive income      
Non-operating income (0.1) (3.1)  
Provision for income taxes 0.0 0.8  
Reclassification out of accumulated other comprehensive income [Member] | Accumulated other comprehensive income (loss) [Member]      
Reclassification adjustment out of accumulated other comprehensive income      
Non-operating income (0.1) (3.1)  
Equity method investments [Member] | Reclassification out of accumulated other comprehensive income [Member] | Currency translation adjustments [Member]      
Reclassification adjustment out of accumulated other comprehensive income      
Non-operating income 0.0 0.0  
Variable interest entities [Member] | Reclassification out of accumulated other comprehensive income [Member] | Currency translation adjustments [Member]      
Reclassification adjustment out of accumulated other comprehensive income      
Non-operating income $ (0.1) $ (3.1)  
Accounting standards update 2018-02, available for sale securities [Member] | Retained earnings [Member]      
Reclassification adjustment out of accumulated other comprehensive income      
Reclassification adjustment of stranded taxes on available-for-sale investments     $ (1.7)
Accounting standards update 2018-02, available for sale securities [Member] | Accumulated other comprehensive income (loss) [Member]      
Reclassification adjustment out of accumulated other comprehensive income      
Reclassification adjustment of stranded taxes on available-for-sale investments     $ 1.7