Revenue Recognition - Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Receivables from contracts with customers, net of allowances	$ 2,354.3	$ 2,228.3
Increase (decrease) in receivables	126.0
Contract liabilities: Advance payments from customers	492.7	$ 458.4
Increase (decrease) in liabilities	$ 34.3