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Accounting Policies - Accumulated Other Comprehensive Loss by Component, Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance $ 10,152.7 $ 9,993.6
Other comprehensive (loss) income before reclassifications (70.6) (178.7)
Amounts reclassified from accumulated other comprehensive loss 0.7 0.7
Net current-period other comprehensive (loss) income (69.9) (178.0)
Ending Balance 10,177.1 9,797.7
Foreign currency translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (260.2) (308.6)
Other comprehensive (loss) income before reclassifications (61.7) (181.4)
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0
Net current-period other comprehensive (loss) income (61.7) (181.4)
Ending Balance (321.9) (490.0)
Derivative contracts    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance 2.4 (3.3)
Other comprehensive (loss) income before reclassifications (5.9) 6.1
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0
Net current-period other comprehensive (loss) income (5.9) 6.1
Ending Balance (3.5) 2.8
Pension and post retirement benefit plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (81.3) (70.7)
Other comprehensive (loss) income before reclassifications (3.0) (3.4)
Amounts reclassified from accumulated other comprehensive loss 0.7 0.7
Net current-period other comprehensive (loss) income (2.3) (2.7)
Ending Balance (83.6) (73.4)
AOCI Attributable to Parent    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (339.1) (382.6)
Net current-period other comprehensive (loss) income (69.9) (178.0)
Ending Balance $ (409.0) $ (560.6)