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Shareholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		6 Months Ended
	May 10, 2019	May 04, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Aug. 31, 2019	Aug. 31, 2018	Jul. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Interest and other (income) expenses, net			$ (70.2)	$ 10.5	$ (58.3)	$ 26.6
Dividends declared (in dollars per share)	$ 1.09	$ 1.01
Dividends paid date					Jun. 14, 2019	Jun. 15, 2018
Dividends record date					Jun. 03, 2019	Jun. 01, 2018
Total cost of shares repurchased					$ 101.0	$ 113.2
Common Stock Repurchase 2019 Authorization | Scenario Forecast
Equity, Class of Treasury Stock [Line Items]
Shares authorized to be repurchased (in shares)							6,000,000.0
Common Stock Repurchase 2018 Authorization
Equity, Class of Treasury Stock [Line Items]
Shares authorized to be repurchased (in shares)								6,000,000.0
Shares repurchased during period (in shares)					1,200,000
Total cost of shares repurchased					$ 101.0
Shares remaining authorized for repurchase (in shares)			1,900,000		1,900,000
2016 Authorization
Equity, Class of Treasury Stock [Line Items]
Shares authorized to be repurchased (in shares)									6,000,000.0
Shares repurchased during period (in shares)						1,000,000.0
Total cost of shares repurchased						$ 113.2
Shares remaining authorized for repurchase (in shares)			0		0
Non-Controlling Interests
Equity, Class of Treasury Stock [Line Items]
Interest and other (income) expenses, net			$ 0.1	$ 1.0	$ 1.1	$ 2.2

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