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Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	May 01, 2019
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Short-term borrowings	$ 279.7	$ 351.4
Senior Notes	1,514.4	1,812.5
Business Acquisition Liabilities			$ 0.0
Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents	15.8	73.7
Short-term borrowings	279.7	351.4
Business Acquisition Liabilities	20.0	118.0
Fair Value \| Fair Value, Inputs, Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents	15.8	73.7
Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Short-term borrowings	279.7	351.4
Fair Value \| Fair Value, Inputs, Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Business Acquisition Liabilities	20.0	118.0
Interest Rate Swap Lock Agreement Asset (Liability) \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Interest Rate Swap Lock Agreement liability	39.8	57.0
Interest Rate Swap Lock Agreement Asset (Liability) \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Interest Rate Swap Lock Agreement liability	39.8	57.0
Term Loan Due May 1, 2022 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Term loan	0.0	300.0
Term Loan Due May 1, 2022 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Term loan	0.0	300.0
2.45% Senior notes due August 1, 2022 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	299.9	299.9
2.45% Senior notes due August 1, 2022 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	305.2	310.1
2.875% Senior notes due October 1, 2022 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	400.0	399.9
2.875% Senior notes due October 1, 2022 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	410.1	416.6
3.15% Senior notes due August 1, 2027 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	424.7	424.7
3.15% Senior notes due August 1, 2027 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	470.4	472.4
3.95% Senior notes due August 1, 2047 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	397.5	397.4
3.95% Senior notes due August 1, 2047 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	$ 468.2	$ 502.2