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Accumulated Other Comprehensive Loss, Net of Tax Reclassifications from AOCI, net of tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total income tax effect $ (2.1) $ (2.1) $ (4.2)
Total reclassified from AOCI, net of tax 14.1 8.1 31.5
Foreign Currency Translation Adjustment      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification from AOCI, before tax [1] 1.1 3.7 23.3
Available-for-sale Securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification from AOCI, before tax (0.7) (1.3) 0.0
Derivative Instruments      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification from AOCI, before tax 2.1 2.0 2.0
Defined Benefit and Postretirement Plans      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification from AOCI, before tax $ 13.7 $ 5.8 $ 10.4
[1] These foreign currency translation adjustments are primarily a result of the sales of businesses.