Debt and Credit Facilities - Total Debt Outstanding (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Short-term borrowings	$ 0.4	$ 7.2
Current portion of long-term debt	22.9	22.3
Total current debt	23.3	29.5
Other	24.1	24.9
Total long-term debt, less current portion	3,711.8	3,731.4
Total debt	3,735.1	3,760.9
Finance lease liability, current	11.2	10.5
Finance lease liability, noncurrent	21.8	23.9
Unamortized discounts ands issuance costs	$ 17.7	$ 20.1
Short-term debt, weighted average interest rate	5.00%	2.20%
Long-term debt, weighted average interest rate	4.40%	4.40%
Senior Notes due December 2022
Debt Instrument [Line Items]
Debt interest rate	4.875%
Senior notes	$ 423.7	$ 423.3
Senior Notes due April 2023
Debt Instrument [Line Items]
Debt interest rate	5.25%
Senior notes	$ 423.3	422.9
Senior Notes due September 2023
Debt Instrument [Line Items]
Debt interest rate	4.50%
Senior notes	$ 474.4	490.2
Senior Notes due December 2024
Debt Instrument [Line Items]
Debt interest rate	5.125%
Senior notes	$ 422.5	422.1
Senior Notes due September 2025
Debt Instrument [Line Items]
Debt interest rate	5.50%
Senior notes	$ 398.0	397.8
Senior Notes due December 2027
Debt Instrument [Line Items]
Debt interest rate	4.00%
Senior notes	$ 421.1	420.9
Senior Notes due July 2033
Debt Instrument [Line Items]
Debt interest rate	6.875%
Senior notes	$ 446.1	446.0
Term Loan A due August 2022
Debt Instrument [Line Items]
Term loans	474.8	474.7
Term Loan A due July 2023
Debt Instrument [Line Items]
Term loans	203.8	208.6
Line of Credit
Debt Instrument [Line Items]
Short-term borrowings	$ 0.4	$ 7.2