CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interest
Beginning Balance (in shares) at Dec. 31, 2017		132,349,534		(36,315,182)
Beginning Balance at Dec. 31, 2017	$ 2,828.5	$ 1.3	$ 906.6	$ (827.4)	$ 2,773.3	$ (45.0)	$ 19.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends	(34.8)				(34.8)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	0.8		(10.3)	$ 11.1
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax (in shares)				572,594
Stock based compensation	20.5		20.5
Net income (loss)	256.9				260.6		(3.7)
Other comprehensive income, net of tax	(160.7)					(160.7)
Other owner changes	(0.8)						(0.8)
Ending Balance (in shares) at Sep. 30, 2018		132,349,534		(35,742,588)
Ending Balance at Sep. 30, 2018	2,910.4	$ 1.3	916.8	$ (816.3)	2,999.1	(205.7)	15.2
Beginning Balance (in shares) at Jun. 30, 2018		132,349,534		(35,963,155)
Beginning Balance at Jun. 30, 2018	2,874.6	$ 1.3	910.4	$ (821.2)	2,923.0	(156.2)	17.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends	(11.6)				(11.6)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	4.8		(0.1)	$ 4.9
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax (in shares)				220,567
Stock based compensation	6.5		6.5
Net income (loss)	86.1				87.7		(1.6)
Other comprehensive income, net of tax	(49.5)					(49.5)
Other owner changes	(0.5)						(0.5)
Ending Balance (in shares) at Sep. 30, 2018		132,349,534		(35,742,588)
Ending Balance at Sep. 30, 2018	$ 2,910.4	$ 1.3	916.8	$ (816.3)	2,999.1	(205.7)	15.2
Beginning Balance (in shares) at Dec. 31, 2018	132,349,534	132,349,534		(35,734,588)
Beginning Balance at Dec. 31, 2018	$ 2,869.1	$ 1.3	914.6	$ (816.1)	3,022.0	(256.6)	3.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends	(58.2)				(58.2)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	(14.0)		(22.5)	$ 8.5
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax (in shares)				463,890
Stock based compensation	36.1		36.1
Net income (loss)	189.5				191.0		(1.5)
Other comprehensive income, net of tax	(212.0)					(212.0)
Acquisitions, net (in shares)		65,782,182
Acquisitions, net	6,918.9	$ 0.7	6,887.6				30.6
Other owner changes (in shares)		28,815,464
Other owner changes	0.0
Ending Balance (in shares) at Sep. 30, 2019		226,947,180		(35,270,698)
Ending Balance at Sep. 30, 2019	9,729.4	$ 2.0	7,815.8	$ (807.6)	3,154.8	(468.6)	33.0
Beginning Balance (in shares) at Jun. 30, 2019		223,431,716		(35,248,610)
Beginning Balance at Jun. 30, 2019	9,835.2	$ 2.0	7,807.1	$ (805.6)	3,087.5	(289.2)	33.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends	(23.8)				(23.8)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	(5.5)		(3.5)	$ (2.0)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax (in shares)				(22,088)
Stock based compensation	12.2		12.2
Net income (loss)	90.6				91.1		(0.5)
Other comprehensive income, net of tax	(179.4)					(179.4)
Other owner changes (in shares)		3,515,464
Other owner changes	0.1						0.1
Ending Balance (in shares) at Sep. 30, 2019		226,947,180		(35,270,698)
Ending Balance at Sep. 30, 2019	$ 9,729.4	$ 2.0	$ 7,815.8	$ (807.6)	$ 3,154.8	$ (468.6)	$ 33.0