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Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance $ (135.2)      
Amount reclassified, net of tax, upon adoption of ASU 2016-01 10,686.1 $ 13,339.1 $ 13,031.6 $ 12,598.1
Other comprehensive income (loss) before reclassifications (145.6) 230.8 29.5  
Amounts reclassified from accumulated other comprehensive income (loss) (18.2) (125.6) 47.0  
Net current period other comprehensive income (loss) (163.8) 105.2 76.5  
AOCI, ending balance (299.0) (135.2)    
Cumulative Effect, Period of Adoption, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Amount reclassified, net of tax, upon adoption of ASU 2016-01       106.1
Accumulated other comprehensive loss        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance (135.2) (240.4) (318.4)  
Amount reclassified, net of tax, upon adoption of ASU 2016-01 (299.0) (135.2) (240.4) (318.4)
AOCI, ending balance (299.0) (135.2) (240.4)  
Accumulated other comprehensive loss | Cumulative Effect, Period of Adoption, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Amount reclassified, net of tax, upon adoption of ASU 2016-01       1.5
Accumulated other comprehensive loss | Cumulative Effect, Period of Adoption, Adjusted Balance        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance     (316.9)  
Unrealized Gains (Losses) on Securities Available for Sale, net of tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance 4.2 (4.0) (1.6)  
Other comprehensive income (loss) before reclassifications (9.3) 11.8 (10.6)  
Amounts reclassified from accumulated other comprehensive income (loss) 6.5 (3.6) 6.7  
Net current period other comprehensive income (loss) (2.8) 8.2 (3.9)  
AOCI, ending balance 1.4 4.2 (4.0)  
Unrealized Gains (Losses) on Securities Available for Sale, net of tax | Cumulative Effect, Period of Adoption, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Amount reclassified, net of tax, upon adoption of ASU 2016-01       1.5
Unrealized Gains (Losses) on Securities Available for Sale, net of tax | Cumulative Effect, Period of Adoption, Adjusted Balance        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance     (0.1)  
Unrealized Gains (Losses) on Cash Flow Hedges, net of tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance 7.8 34.7 (104.5)  
Other comprehensive income (loss) before reclassifications (165.0) 88.1 97.4  
Amounts reclassified from accumulated other comprehensive income (loss) (21.8) (115.0) 41.8  
Net current period other comprehensive income (loss) (186.8) (26.9) 139.2  
AOCI, ending balance (179.0) 7.8 34.7  
Unrealized Gains (Losses) on Cash Flow Hedges, net of tax | Cumulative Effect, Period of Adoption, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Amount reclassified, net of tax, upon adoption of ASU 2016-01       0.0
Unrealized Gains (Losses) on Cash Flow Hedges, net of tax | Cumulative Effect, Period of Adoption, Adjusted Balance        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance     (104.5)  
Gains (Losses) on Net Investment Hedge, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance 25.1 3.5 0.0  
Other comprehensive income (loss) before reclassifications (30.7) 28.6 5.0  
Amounts reclassified from accumulated other comprehensive income (loss) (2.9) (7.0) (1.5)  
Net current period other comprehensive income (loss) (33.6) 21.6 3.5  
AOCI, ending balance (8.5) 25.1 3.5  
Gains (Losses) on Net Investment Hedge, Net of Tax | Cumulative Effect, Period of Adoption, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Amount reclassified, net of tax, upon adoption of ASU 2016-01       0.0
Gains (Losses) on Net Investment Hedge, Net of Tax | Cumulative Effect, Period of Adoption, Adjusted Balance        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance     0.0  
Unfunded Status of Postretirement Benefit Plans, net of tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance (32.8) (31.3) (36.8)  
Other comprehensive income (loss) before reclassifications (33.5) (1.5) 5.5  
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0 0.0  
Net current period other comprehensive income (loss) (33.5) (1.5) 5.5  
AOCI, ending balance (66.3) (32.8) (31.3)  
Unfunded Status of Postretirement Benefit Plans, net of tax | Cumulative Effect, Period of Adoption, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Amount reclassified, net of tax, upon adoption of ASU 2016-01       0.0
Unfunded Status of Postretirement Benefit Plans, net of tax | Cumulative Effect, Period of Adoption, Adjusted Balance        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance     (36.8)  
Currency Translation Adjustments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance (139.5) (243.3) (175.5)  
Other comprehensive income (loss) before reclassifications 92.9 103.8 (67.8)  
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0 0.0  
Net current period other comprehensive income (loss) 92.9 103.8 (67.8)  
AOCI, ending balance $ (46.6) $ (139.5) (243.3)  
Currency Translation Adjustments | Cumulative Effect, Period of Adoption, Adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Amount reclassified, net of tax, upon adoption of ASU 2016-01       $ 0.0
Currency Translation Adjustments | Cumulative Effect, Period of Adoption, Adjusted Balance        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
AOCI, beginning balance     $ (175.5)