Long-Term Debt - Long-term Debt Components (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total long-term debt	$ 2,323.2	$ 1,554.8
Less: current portion of long-term debt	(76.5)	(79.1)
Long-term debt before debt issuance costs and discount	2,246.7	1,475.7
Less: debt issuance costs and discount	(20.0)	(10.6)
Long-term debt, net of current portion	2,226.7	1,465.1
Other Debt [Member]
Debt Instrument [Line Items]
Total long-term debt	21.1	41.7
Medium-term Notes [Member] | Term Loan A [Member]
Debt Instrument [Line Items]
Total long-term debt	1,164.1	1,203.1
Line of Credit [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total long-term debt	138.0	310.0
Senior Notes [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 1,000.0	$ 0.0