Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Debt and Average Interest Rates on Debt Outstanding

Debt and the average interest rates on debt outstanding were as follows:

In millions	Average interest rate at	Maturity year	December 31
	December 31, 2017		2017			2016
Commercial paper	2.340%	2019	$	34.0		$	398.7
Revolving credit facilities	3.064%	2019	28.4			576.8
Senior notes - fixed rate (1)	1.875%	2017	—			350.0
Senior notes - fixed rate (1)	2.900%	2018	255.3			500.0
Senior notes - fixed rate (1)	2.650%	2019	250.0			250.0
Senior notes - fixed rate - Euro (1)	2.450%	2019	594.4			520.7
Senior notes - fixed rate (1)	3.625%	2020	74.0			400.0
Senior notes - fixed rate (1)	5.000%	2021	103.8			500.0
Senior notes - fixed rate (1)	3.150%	2022	88.3			550.0
Senior notes - fixed rate (1)	4.650%	2025	19.3			250.0
Other	N/A	N/A	—			0.8
Unamortized issuance costs and discounts	N/A	N/A	(6.8		)	(17.8		)
Total debt			1,440.7			4,279.2
Less: Current maturities and short-term borrowings			—			(0.8		)
Long-term debt			$	1,440.7		$	4,278.4
(1) Senior notes guaranteed as to payment by Pentair plc and PISG ("the Notes")

Debt Outstanding Matures on Calendar Year Basis

Debt outstanding, excluding unamortized issuance costs and discounts, at December 31, 2017 matures on a calendar year basis as follows:

In millions	2018		2019		2020		2021		2022		Thereafter		Total
Contractual debt obligation maturities	$	—	$	1,162.1	$	74.0	$	103.8	$	88.3	$	19.3	$	1,447.5