Fair Value Measurements - Financial Instruments at Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets:
Goodwill carrying value	$ 2,999.4	$ 3,095.7	$ 3,102.8
Assets Held for Sale | Mexico and Brazil-based Over-the-counter Businesses
Liabilities:
Total impairment charge	162.2
Recurring | Level 1
Assets:
Investment securities	0.4	2.5
Foreign currency forward contracts	0.0	0.0
Cross-currency swap	0.0	0.0
Foreign currency option contracts	0.0	0.0
Total assets	0.4	2.5
Liabilities:
Foreign currency forward contracts	0.0	0.0
Cross-currency swap	0.0	0.0
Total liabilities	0.0	0.0
Recurring | Level 2
Assets:
Investment securities	0.0	0.0
Foreign currency forward contracts	5.7	9.8
Cross-currency swap	0.0	6.3
Foreign currency option contracts	5.0	0.0
Total assets	10.7	16.1
Liabilities:
Foreign currency forward contracts	2.4	7.9
Cross-currency swap	13.8	0.0
Total liabilities	16.2	7.9
Recurring | Level 3
Assets:
Investment securities	0.0	0.0
Foreign currency forward contracts	0.0	0.0
Cross-currency swap	0.0	0.0
Foreign currency option contracts	0.0	0.0
Total assets	0.0	0.0
Liabilities:
Foreign currency forward contracts	0.0	0.0
Cross-currency swap	0.0	0.0
Total liabilities	0.0	0.0
Nonrecurring | Level 1
Assets:
Goodwill	0.0	0.0
Total assets	0.0	0.0
Liabilities:
Liabilities held-for-sale, net	0.0	0.0
Total liabilities	0.0	0.0
Nonrecurring | Level 2
Assets:
Goodwill	0.0	0.0
Total assets	0.0	0.0
Liabilities:
Liabilities held-for-sale, net	0.0	0.0
Total liabilities	0.0	0.0
Nonrecurring | Level 3
Assets:
Goodwill	71.7	0.0
Total assets	71.7	0.0
Liabilities:
Liabilities held-for-sale, net	16.8	0.0
Total liabilities	16.8	0.0
CSCA
Assets:
Goodwill carrying value	1,902.4	$ 1,905.0	$ 1,899.1
CSCA | Nonrecurring
Assets:
Goodwill carrying value	$ 81.7