Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Short-term borrowings	$ 1.8	$ 270.9
Senior Notes	2,105.3	2,103.4
Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents	234.6	95.8
Short-term borrowings	1.8	270.9
Contingent Consideration	23.0	23.2
Fair value adjustment (liability) asset related to hedged fixed rate debt instrument	(3.0)	(2.2)
Fair Value \| Fair Value, Inputs, Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents	234.6	95.8
Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value adjustment (liability) asset related to hedged fixed rate debt instrument	(3.0)	(2.2)
Short-term borrowings	1.8	270.9
Fair Value \| Fair Value, Inputs, Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Contingent Consideration	23.0	23.2
Interest Rate Swap Lock Agreement \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Interest Rate Swap Lock Agreement	(7.0)	0.0
Interest Rate Swap Lock Agreement \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Interest Rate Swap Lock Agreement	(7.0)	0.0
Floating Rate Senior notes due January 25, 2019 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	300.0	300.0
Floating Rate Senior notes due January 25, 2019 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	299.9	299.9
2.45% Senior notes due December 15, 2019 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	300.0	299.9
2.45% Senior notes due December 15, 2019 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	297.4	300.9
2.45% Senior notes due August 1, 2022 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	299.7	299.7
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	289.7	296.1
2.875% Senior notes due October 1, 2022 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	399.9	399.8
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	393.0	400.2
3.15% Senior notes due August 1, 2027 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	424.6	424.6
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	400.0	417.8
3.95% Senior notes due August 1, 2047 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Notes	397.2	397.1
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	$ 363.7	$ 397.4

Amount of liability recognized arising from contingent consideration in a business combination.

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