Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 5,668.0	$ 6,170.5	$ 5,958.1
OCI before reclassifications	60.1	(163.4)
Amounts reclassified from AOCI	(5.3)	(4.1)
Other comprehensive income (loss), net of tax	54.8	(167.5)	334.9
Balance	5,803.8	5,668.0	6,170.5
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income [Roll Forward]
Balance	84.6	253.1	(81.8)
Other comprehensive income (loss), net of tax	54.8	(167.5)	334.9
Balance	139.4	84.6	253.1
Fair Value of Derivative Financial Instruments, net of tax
Accumulated Other Comprehensive Income [Roll Forward]
Balance	(15.5)	(9.8)
OCI before reclassifications	26.8	(7.5)
Amounts reclassified from AOCI	1.4	1.8
Other comprehensive income (loss), net of tax	28.2	(5.7)
Balance	12.7	(15.5)	(9.8)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income [Roll Forward]
Balance	104.5	260.6
OCI before reclassifications	28.4	(156.1)
Amounts reclassified from AOCI	0.0	0.0
Other comprehensive income (loss), net of tax	28.4	(156.1)
Balance	132.9	104.5	260.6
Fair Value of Investment Securities, net of tax
Accumulated Other Comprehensive Income [Roll Forward]
Balance	0.0	1.0
OCI before reclassifications	0.0	0.0
Amounts reclassified from AOCI	0.0	0.0
Other comprehensive income (loss), net of tax	0.0	0.0
Balance	0.0	0.0	1.0
Post-Retirement and Pension Liability Adjustments, net of tax
Accumulated Other Comprehensive Income [Roll Forward]
Balance	(4.4)	1.3
OCI before reclassifications	4.9	0.2
Amounts reclassified from AOCI	(6.7)	(5.9)
Other comprehensive income (loss), net of tax	(1.8)	(5.7)
Balance	$ (6.2)	(4.4)	1.3
ASU 2016-01
Accumulated Other Comprehensive Income [Roll Forward]
ASU 2016-01 adoption impact			(1.0)
ASU 2016-01 | Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income [Roll Forward]
Balance		252.1
Balance			252.1
ASU 2016-01 | Fair Value of Derivative Financial Instruments, net of tax
Accumulated Other Comprehensive Income [Roll Forward]
Balance		(9.8)
Balance			(9.8)
ASU 2016-01 adoption impact			0.0
ASU 2016-01 | Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income [Roll Forward]
Balance		260.6
Balance			260.6
ASU 2016-01 adoption impact			0.0
ASU 2016-01 | Fair Value of Investment Securities, net of tax
Accumulated Other Comprehensive Income [Roll Forward]
Balance		0.0
Balance			0.0
ASU 2016-01 adoption impact			(1.0)
ASU 2016-01 | Post-Retirement and Pension Liability Adjustments, net of tax
Accumulated Other Comprehensive Income [Roll Forward]
Balance		$ 1.3
Balance			1.3
ASU 2016-01 adoption impact			$ 0.0