Significant Equity Method Investees (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Significant Equity Method Investees
Equity in earnings of affiliates	$ 66.2	$ 43.3	$ 110.6	$ 109.6
Condensed income statement information
Gross profit	956.5	869.7	2,286.1	2,589.0
Income from continuing operations	247.5	116.0	343.6	333.5
Net income	$ 247.6	$ 116.1	$ 343.9	333.8
PTL
Significant Equity Method Investees
Ownership percentage of equity method investment	28.90%		28.90%
Equity in earnings of affiliates			$ 108.0	106.0
Condensed income statement information
Revenues			6,542.0	6,701.0
Gross profit			1,430.0	1,397.0
Income from continuing operations			373.0	367.0
Net income			$ 373.0	$ 367.0